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Blood Sugar and Dizziness After 50: Highs, Lows, and Where Berberine Fits In

Portrait of Emily Carter, wellness content writer at Better Hearing Daily By Emily Carter
14-minute read
Man in his sixties resting on a stone wall by a hillside vineyard after a bike ride, sipping water with an apple beside him, pacing food and activity to manage blood sugar and dizziness after 50

Food, activity and medication timing all shape blood sugar. After 50, they also shape how steady you feel on your feet.

Quick answer

Yes, blood sugar can cause dizziness. Low blood sugar, below 70 mg/dL for most people with diabetes, often brings dizziness, shakiness and sweating. Very high sugar dehydrates you and, over years, can damage the nerves that steady blood pressure. After 50, after-meal blood pressure drops add another cause. Berberine lowers glucose, so check medications first.

For education, not medical advice. Emily Carter is a wellness content writer, not a physician, pharmacist, dietitian, or diabetes educator. If you have diabetes, your own care team's targets and instructions come first. Supplements such as berberine and chromium can change blood sugar and interact with prescription drugs. This page links to our review of Vertigenics, which contains affiliate links. If you buy through them, we may earn a small commission at no extra cost to you.

How we researched this: Every number below comes from the linked source: the American Diabetes Association, CDC, NIDDK, NIH Office of Dietary Supplements, NCCIH, MedlinePlus, and peer-reviewed studies read through PubMed. Where research on berberine is limited or mixed, we say so. Sources were last checked on October 21, 2026.

Dizziness is one of those symptoms people tend to blame on the ears. Sometimes that is right, and our guide to supplements and vitamins for vertigo after 50 covers the inner-ear side. But a large share of dizzy spells in midlife and later have nothing to do with the inner ear. They come from the fuel and pressure supply to the brain, and blood sugar sits right in the middle of that.

This guide explains how blood sugar and dizziness are connected after 50: what a low feels like compared with a high, why spells cluster in the morning and after meals, what to do in the next fifteen minutes, and where popular blood-sugar supplements such as berberine fit, including why they deserve a medication check before the first capsule.

Can high or low blood sugar cause dizziness?

Yes, both can. Low blood sugar is the more common and faster cause: the CDC lists dizziness among the classic symptoms, along with shaking, sweating and a fast heartbeat. Very high blood sugar can leave you weak and dehydrated, and years of high levels can damage the nerves that keep blood pressure steady when you stand.

Your brain runs mostly on glucose, and it cannot store much of it. When blood sugar drops, the brain is one of the first organs to notice. The CDC defines low blood sugar as below 70 mg/dL and lists dizziness alongside a fast heartbeat, shaking, sweating, nervousness or anxiety, irritability or confusion, and hunger.[1] The NIDDK describes mild-to-moderate lows the same way: shaky or jittery, hungry, and "dizzy, lightheaded, confused, or irritable."[2]

High blood sugar works more slowly. The American Diabetes Association lists frequent urination and increased thirst as key signs, because the body flushes extra glucose out through the urine and takes water with it.[3] When levels climb very high for days, a dangerous state called hyperosmolar hyperglycemic syndrome can develop. MedlinePlus says it is seen more often in people with poorly controlled type 2 diabetes, lists older age as a risk factor, and describes thirst, weakness, nausea and confusion as symptoms.[4] Feeling unsteady and drained in that situation is a warning, not a nuisance.

There is also a long-term route. Over time, the NIDDK explains, high blood glucose can damage the nerves that control heart rate and blood pressure. Those nerves then respond more slowly, and "you may feel light-headed or faint when you stand up from lying down or sitting."[5] This is called autonomic neuropathy, and it is one reason dizziness on standing deserves attention in anyone who has lived with diabetes for years.

What does blood sugar dizziness feel like, and how is it different from vertigo?

Blood sugar dizziness usually feels lightheaded, weak or woozy rather than spinning, and it tends to come with shakiness, sweating, hunger or confusion. True vertigo, where the room seems to turn, points more toward the inner ear. A blood pressure drop feels like graying out when you stand or after eating. Checking glucose during a spell separates them.

People often use "dizzy" for very different sensations, and the difference matters because each one points to a different cause. Here is a practical way to sort them before you talk with your doctor:

What it feels like Common companions Typical timing Possible source
Lightheaded, shaky, weak, foggy Sweating, hunger, fast heartbeat, irritability Late for a meal, after exercise, after alcohol, overnight Low blood sugar
Drained, woozy, slow Strong thirst, frequent urination, dry mouth Builds over hours or days High blood sugar and dehydration
Vision grays out, legs feel weak Better within seconds to minutes of sitting down On standing, or within a couple of hours after a meal Blood pressure drop
Room spins or tilts Nausea; sometimes ringing or ear fullness Rolling over in bed, tipping the head, or in attacks Inner ear (BPPV, Ménière's, neuritis) or migraine

A general guide drawn from the CDC, NIDDK, ADA and the studies cited below, not a diagnostic tool. Causes can overlap.

If the room genuinely spins when you roll over in bed or look up, the inner ear is the more likely culprit. Our article on vitamin D and BPPV after 50 covers that common positional type. If ringing in the ears travels with your dizzy spells, our guide to tinnitus causes explains what is worth mentioning to your doctor.

At what blood sugar level do you feel dizzy?

There is no single number. For many people with diabetes, low blood sugar starts below 70 mg/dL, and both the NIDDK and the ADA note that your care team may set a different target for you.[2][6] The CDC defines severe low blood sugar as below 54 mg/dL, a level at which people may feel weak, have trouble walking or seeing clearly, act confused, or have seizures.[1] On the high side, the ADA advises checking urine for ketones once blood glucose is above 240 mg/dL.[3] How you feel at a given number varies from person to person, which is exactly why a reading during the spell is so useful.

Why are dizzy spells after meals or in the morning more common after 50?

Age stacks several risks together. Diabetes affects about 27% of U.S. adults aged 60 and older, being 65 or older is a listed risk factor for low blood sugar, and blood pressure drops after meals were found in roughly 40% of older adults in a 2024 review. Some heart medicines, such as beta blockers, can also hide warning signs.

The numbers explain a lot. According to a 2024 CDC National Center for Health Statistics data brief, total diabetes, diagnosed and undiagnosed, reached 27.3% among U.S. adults aged 60 and older during August 2021 to August 2023, and 4.5% of all U.S. adults had diabetes without knowing it.[7] The NIDDK lists being 65 or older as a risk factor for low blood glucose, along with insulin use, earlier lows, and kidney disease, heart disease or cognitive impairment.[2]

Dizzy after eating: the blood pressure drop many people miss

After a meal, blood flow shifts toward the gut. Younger bodies compensate quickly; older ones often do not. A drop of 20 mm Hg or more in systolic pressure after eating is called postprandial hypotension, and a classic review in Annals of Internal Medicine linked it to dizziness, weakness, falls and fainting. The authors called it "particularly common in older hypertensive patients" and probably more common than the better-known drop on standing.[8]

A 2024 meta-analysis in Age and Ageing pooled 13 studies with 3,021 older adults and estimated a prevalence of 40.5%: 32.8% in community settings, 39.4% in long-term care, and 49.3% in hospital geriatric wards. The authors flagged very high variation between studies, partly because diagnostic criteria differ.[9] In other words, "I get woozy after lunch" is common after 50, and it is not always about sugar.

Two friends in their sixties taking an easy after-lunch walk along a riverside path, an unhurried routine for people dealing with blood sugar and dizziness after meals
Smaller meals and an unhurried pace after eating are simple habits worth discussing with your doctor if you feel woozy after meals.

Dizzy in the morning: overnight lows and that first stand

Mornings bring two separate risks. The NIDDK notes that blood glucose can drop during sleep and stay low for hours, with clues such as crying out or nightmares, sweating enough to soak the sheets, and feeling tired, irritable or confused on waking.[2] Then comes the first stand of the day, when blood pressure must adjust quickly. In people with autonomic neuropathy from long-standing diabetes, that adjustment can be sluggish, and the NIDDK advises sitting or standing slowly to prevent light-headedness or fainting.[5]

When warning signs go quiet

Some people stop feeling the early alarms of a low. This is called hypoglycemia unawareness. The NIDDK says repeated lows and autonomic neuropathy can contribute to it, and the CDC notes it may be more likely in people who take certain medicines, such as beta blockers for high blood pressure.[2][5][1] For someone over 50 on both diabetes and heart medicines, dizziness may be one of the few signs that gets through, so it is worth taking seriously.

How do you stop dizziness from low blood sugar?

Sit down first, then check your glucose if you can. If it is below 70 mg/dL, follow the 15-15 rule: take 15 to 20 grams of fast-acting carbohydrate, such as four glucose tablets or 4 ounces of regular fruit juice, wait 15 minutes, and recheck. Repeat if still low, then eat a snack.

The ADA calls this the 15/15 rule, and the NIDDK spells out the details.[6][2] In practice:

  1. Sit or lie down so a fall is not added to the problem.
  2. Check your blood glucose if you have a meter or continuous monitor, so you know what you are treating.
  3. Take 15 to 20 grams of fast-acting carbohydrate, such as four glucose tablets or 4 ounces (half a cup) of non-diet fruit juice. The NIDDK advises avoiding orange juice if you have kidney disease.
  4. Wait 15 minutes and recheck. If you are still low, repeat.
  5. Eat a snack once you are back in range if your next meal is more than an hour away.
Man in his sixties sitting courtside after a pickleball game, drinking a small bottle of orange juice while a friend checks on him, a fast-acting carbohydrate for low blood sugar
Four glucose tablets or half a cup of regular juice is a typical 15-gram dose for treating a low.

Preventing the next spell

Treatment in the moment matters, but the pattern matters more. The CDC lists taking too much insulin, not eating enough carbohydrate for the insulin taken, drinking alcohol, and the amount and timing of physical activity among the causes of lows, and advises regular meals to avoid nighttime lows.[1] The NIDDK names insulin and medicines that push the pancreas to release insulin, sulfonylureas and meglitinides, as the main drug causes.[2] If spells keep happening, bring a log of times, meals, readings and medicines to your doctor; a dose or timing change is often the real fix. For after-meal blood pressure drops, ask whether smaller meals or a change in when you take blood pressure pills makes sense for you.

Can berberine cause dizziness?

Dizziness is not among the common berberine side effects listed by NIH's NCCIH, which are mostly stomach-related. Indirect dizziness is plausible, though: berberine lowers blood glucose and may add to blood pressure medicines, so combining it with prescriptions could push sugar or pressure too low. If you feel dizzy after starting it, check both and call your doctor.

Berberine is a compound found in plants such as European barberry, goldenseal and Oregon grape. The NIH's National Center for Complementary and Integrative Health says there is some evidence it may have a modest effect on lowering blood glucose, that it may reduce cholesterol, and that it may have additional benefit for high blood pressure when used together with the drug amlodipine. The most common side effects it lists are abdominal pain, constipation, diarrhea, nausea and vomiting. It also warns that berberine "might also interact with medicines in negative ways," and that people who are pregnant or breastfeeding should not use it.[10]

On the diabetes side, NCCIH describes a 2021 review of 46 studies suggesting berberine may help lower blood glucose, while noting that the studies were mostly among Chinese patients and the effects varied widely.[11] A 2022 meta-analysis of 37 trials with 3,048 people with type 2 diabetes found an average HbA1c drop of 0.63 percentage points. In that analysis, berberine alone or combined with oral diabetes drugs did not significantly raise the risk of hypoglycemia, although the confidence range was wide.[12] On blood pressure, a 2015 meta-analysis of 27 trials found that berberine added to blood pressure medicine tended to lower pressure more than the medicine alone, while warning that the included studies were of limited quality.[13]

Put together, the honest reading is this: berberine is not known as a dizziness drug, but it is an active compound that nudges both glucose and blood pressure. For a healthy adult, that may be mild. For someone over 50 already taking medicines that lower those same numbers, the effects can add up, and that is where a dizzy spell can come from.

Where does Vertigenics fit?

Some balance supplements lean on the same blood-sugar ingredients. Vertigenics is one example. Its label lists 100 mg of berberine HCl and 100 mcg of chromium per two-capsule serving, plus alpha-lipoic acid, green tea extract, resveratrol and zinc, with a small proprietary blend that includes banaba leaf and Asian ginseng. In plain terms, much of its formula centers on ingredients studied for glucose metabolism, and, like most supplements, the finished blend has not yet been tested in a published trial. For context, the 100 mg of berberine is below the 200 to 1,000 mg taken two to three times daily that NCCIH describes as the range used in clinical situations, and NCCIH advises anyone taking medicines to talk with their health care provider before taking berberine.[11] If you take metformin, insulin or other diabetes pills, or blood pressure medicine, it is worth reading the safety section of our full Vertigenics review and showing the label to your doctor or pharmacist before ordering. Results vary, and a supplement can support, never replace, medical care for diabetes or dizziness.

Is berberine safe with metformin or blood pressure medication?

It may not be, so take it only with your prescriber's approval. Berberine lowers glucose by itself, chromium may cause lows alongside diabetes drugs, and goldenseal, which contains berberine, has changed metformin levels in studies. Berberine may also add to blood pressure medicine. Never stop or reduce a prescription to make room for a supplement.

Here is what the research and NIH sources actually say about combining these products with common prescriptions:

  • Metformin. An NCCIH-funded study found that metformin levels fell about 25% in healthy adults given goldenseal extract with metformin, enough to potentially hinder glucose control, according to the NCCIH goldenseal page. NCCIH also notes that very little berberine may be absorbed when goldenseal is taken by mouth, so goldenseal and berberine results do not translate directly in either direction.[14] A 2025 follow-up study in adults with type 2 diabetes found no clinically meaningful change overall, but metformin exposure fell by about 20% at low metformin doses, and the authors suggested health care providers may consider cautioning patients about adding goldenseal.[15]
  • Insulin and other diabetes medicines. The NIH Office of Dietary Supplements warns that chromium taken with insulin, metformin or other antidiabetes medicines "might cause low blood sugar levels." The same fact sheet notes the American Diabetes Association does not recommend chromium supplements for people with diabetes, because they have no clear benefit.[16]
  • Blood pressure medicines. NCCIH notes that berberine may add to the effect of amlodipine, and the 2015 meta-analysis found a trend toward larger drops when berberine was combined with blood pressure drugs.[10][13] If you already get lightheaded on standing or after meals, more lowering is not automatically better.

None of this means berberine is off-limits. It means your prescriber should know before you start, so they can watch your readings and adjust if needed. NCCIH puts it plainly: it is very important not to replace medical treatment for diabetes with an unproven health product.[11] Our article on myths and facts about natural supplements covers more of the questions worth asking before any new bottle.

Why are some doctors cautious about berberine?

Mostly for the reasons above, not because it is inactive. It does affect glucose, which is exactly why it can clash with prescriptions. The research behind it, while growing, comes largely from studies in China with variable quality and results, as both NCCIH and the 2015 meta-analysis point out.[11][13] NCCIH also notes berberine should not be used during pregnancy or breastfeeding or given to infants.[10] A cautious doctor is usually asking a simple question: will this help your numbers more than your current plan, and will it make your current plan harder to manage?

When is dizziness with diabetes an emergency?

Call 911 if someone with diabetes is unconscious, having a seizure, or cannot safely swallow, after giving glucagon if it is available. Also call for sudden dizziness with face drooping, arm weakness, slurred speech, vision loss or a severe headache, which can signal stroke. Extreme thirst with confusion or vomiting needs emergency care too.

Severe low blood sugar. The ADA says a severe low can leave you unconscious or unable to eat or drink, and then glucagon is needed; if someone is unconscious and glucagon is not available or no one knows how to use it, call 911 immediately.[6] The NIDDK advises family or coworkers to call 911 right after giving glucagon and recommends wearing a medical alert ID.[2] Do not give food or drink to someone who cannot swallow safely.

Very high blood sugar. MedlinePlus calls hyperosmolar hyperglycemic syndrome a medical emergency and advises going to the emergency room or calling 911 if symptoms appear.[4] The ADA describes ketoacidosis as life-threatening, with warning signs such as shortness of breath, fruity-smelling breath, nausea and vomiting, and a very dry mouth.[3]

Possible stroke. Not every sudden dizzy spell is about sugar. Call 911 right away if dizziness comes on suddenly together with any of these signs listed by the CDC:[17]

  • Sudden trouble walking, dizziness, loss of balance, or lack of coordination
  • Sudden numbness or weakness in the face, arm, or leg, especially on one side
  • Sudden confusion, trouble speaking, or difficulty understanding speech
  • Sudden trouble seeing
  • A sudden severe headache with no known cause

The CDC advises noting the time symptoms started and calling an ambulance rather than driving.[17] If you are unsure whether a spell is a low or something more serious, call; sorting it out is the emergency team's job.

When to book a doctor's visit

Make a prompt appointment if you have repeated lows, morning spells, dizziness after most meals, lightheadedness every time you stand, or new dizziness after starting any medicine or supplement, including berberine or chromium. Bring your glucose log, a home blood pressure reading taken sitting and then standing if your doctor has shown you how, and a full list of pills and supplements. If your dizziness spins rather than drains, or comes with hearing changes, mention that too. Our age-related hearing loss guide explains why the ears and balance often age together, and our article on magnesium for vertigo after 50 covers another supplement that needs the same kind of medication check.

Blood sugar and dizziness after 50 are closely linked, but rarely in a simple way. Lows, highs, after-meal pressure drops and medicines all overlap. A reading during the spell, a careful medicine review and the 15-15 rule do more for most people than any capsule. If you are curious about a blood-sugar supplement, let your doctor see the label first.

Curious about a balance formula?

See what is really on the Vertigenics label

Our in-depth review lists every ingredient and dose in Vertigenics, explains in plain language what the research does and does not show for each one, and walks through the price per bottle and how the 60-day refund window works. It is a good page to read, and to print, before talking it over with your doctor.

Read our full Vertigenics review → Our review page contains affiliate links. If you buy through them, Better Hearing Daily may earn a small commission at no extra cost to you. This does not change our editorial view.

Frequently asked questions

Can low blood sugar cause dizziness when standing up?
It can, because a low leaves the brain short of fuel, so standing may tip you into lightheadedness. But dizziness that appears only when you stand is more often a blood pressure drop. In people with long-standing diabetes, nerve damage can make that drop worse. A meter reading during the spell tells the two apart.
Why do I feel dizzy in the morning with diabetes?
Two common reasons are a low that started overnight and a blood pressure drop when you first stand. The NIDDK says glucose can fall during sleep and stay low for hours, with sweaty sheets, nightmares or waking confused as clues. Check your glucose before getting up and tell your care team about repeated morning spells.
Can you feel dizzy after eating if you are not diabetic?
Yes. A drop in blood pressure after meals, called postprandial hypotension, can cause dizziness and falls without any diabetes. A 2024 review estimated it in about 40% of older adults. Ask your doctor whether smaller meals or changing when you take blood pressure pills could help, and sit down if you feel woozy after eating.
Does berberine dizziness go away?
There is no good data on that, because dizziness is not among the common side effects NCCIH lists for berberine, which are mostly stomach-related. If you feel dizzy after starting it, check your blood sugar and blood pressure, stop the supplement, and call your doctor, especially if you take diabetes or blood pressure medicine.
Can I take berberine with metformin?
Only with your prescriber's approval. Studies of goldenseal, a plant that contains berberine, show it can change how much metformin the body absorbs, and berberine lowers glucose on its own. Your doctor may need to watch your readings or adjust your plan. Never stop or cut back metformin to make room for a supplement.
What blood sugar level is dangerously low?
Below 70 mg/dL is low for most people with diabetes, and the CDC calls anything below 54 mg/dL severe. Severe lows can cause confusion, trouble walking, seizures or passing out and often need help from someone else. If a person cannot swallow safely or is unconscious, give glucagon if available and call 911.

Sources

  1. Centers for Disease Control and Prevention — Low Blood Sugar (Hypoglycemia).
  2. National Institute of Diabetes and Digestive and Kidney Diseases — Low Blood Glucose (Hypoglycemia).
  3. American Diabetes Association — Hyperglycemia (High Blood Glucose).
  4. MedlinePlus, U.S. National Library of Medicine — Diabetic hyperglycemic hyperosmolar syndrome.
  5. National Institute of Diabetes and Digestive and Kidney Diseases — Autonomic Neuropathy.
  6. American Diabetes Association — Hypoglycemia (Low Blood Glucose).
  7. National Center for Health Statistics. "Prevalence of Total, Diagnosed, and Undiagnosed Diabetes in Adults: United States, August 2021–August 2023." NCHS Data Brief No. 516, November 2024. CDC.
  8. Jansen, R.W., Lipsitz, L.A. "Postprandial hypotension: epidemiology, pathophysiology, and clinical management." Annals of Internal Medicine, 1995;122(4):286–295. PubMed.
  9. Huang, L., et al. "Prevalence of postprandial hypotension in older adults: a systematic review and meta-analysis." Age and Ageing, 2024;53(2):afae022. PubMed.
  10. National Center for Complementary and Integrative Health — In the News: Berberine.
  11. National Center for Complementary and Integrative Health — Diabetes and Dietary Supplements: What You Need To Know.
  12. Xie, W., et al. "Glucose-lowering effect of berberine on type 2 diabetes: A systematic review and meta-analysis." Frontiers in Pharmacology, 2022;13:1015045. PubMed.
  13. Lan, J., et al. "Meta-analysis of the effect and safety of berberine in the treatment of type 2 diabetes mellitus, hyperlipemia and hypertension." Journal of Ethnopharmacology, 2015;161:69–81. PubMed.
  14. National Center for Complementary and Integrative Health — Goldenseal.
  15. Nguyen, J.T., et al. "The Pharmacokinetic Interaction Between Metformin and the Natural Product Goldenseal Is Metformin Dose-Dependent: A Three-Arm Crossover Study in Adults With Type 2 Diabetes." Clinical and Translational Science, 2025;18(2):e70120. PubMed.
  16. NIH Office of Dietary Supplements — Chromium Fact Sheet for Consumers.
  17. Centers for Disease Control and Prevention — Signs and Symptoms of Stroke.