Can Vitamins Really Fight Inflammation?

Bottle of niacin capsules on a wooden surface with a blurred background — Photo: Gabriele Paoletti / Shutterstock

Your swollen ankles may not need a prescription — they may need three nutrients your diet stopped delivering the day you started eating like an American.

Quick Take

Dr. Eric Berg points to vitamin B1, potassium, and magnesium as the key nutrients behind swollen legs and ankles.
A diet high in sugar and refined carbs depletes B1, which breaks down the body’s sodium-potassium pump and causes fluid to build up.
Swollen ankles are a symptom, not a diagnosis — serious causes like heart disease or kidney failure need a doctor, not a supplement.
Cutting sugar from your diet may matter just as much as adding any nutrient back in.

Why Your Ankles Puff Up in the First Place

Swollen legs and ankles — called edema — happen when fluid builds up in tissue instead of moving back into the bloodstream. Gravity pulls fluid down into the lower legs all day. Your body has systems to pump that fluid back up. When those systems fail, your ankles swell. The question is what makes those systems fail. The answer, for many people, starts with what they eat.

Dr. Eric Berg, a chiropractor with a massive online following in the health and nutrition space, argues that three nutrients sit at the center of this problem: vitamin B1 (thiamine), potassium, and magnesium. His claim is direct — fix those deficiencies, cut the sugar, and the swelling goes away. ^[2] That is a bold statement. But the underlying biology is worth taking seriously.

The Sodium-Potassium Pump Nobody Talks About

Every cell in your body runs a tiny pump that moves sodium out and potassium in. This pump controls fluid balance at the cellular level. When it works right, fluid stays where it belongs. When it breaks down, fluid leaks into surrounding tissue and you get swelling. Vitamin B1 plays a direct role in keeping that pump running. ^[2] Without enough B1, the pump slows, and fluid starts to pool — especially in the legs and ankles where gravity is already working against you.

Here is the part most people miss: sugar and refined carbohydrates burn through B1 fast. Your body uses B1 to process carbohydrates. The more sugar you eat, the more B1 you use up. ^[2] So the standard American diet — heavy on bread, pasta, sweets, and processed food — quietly drains the very nutrient your body needs to keep fluid from building up. You are not just eating badly. You are actively depleting your own defenses.

Where Magnesium and Potassium Come In

Magnesium deficiency is a known contributor to edema. ^[4] Magnesium helps regulate fluid movement and supports the same cellular pump that B1 enables. Most Americans do not get enough of it. Potassium works alongside sodium in that pump system. Low potassium tips the balance toward fluid retention. ^[1] Together, these three nutrients — B1, magnesium, and potassium — form a team that keeps your body from holding on to excess fluid. Remove any one of them from the equation and the whole system gets sluggish.

Vitamins also play a broader role in circulation and inflammation in the lower legs. Vitamin E widens blood vessels and supports blood flow to the feet and ankles. ^[7] Certain anti-inflammatory compounds improve circulation when sitting for long periods. ^[5] Research from WebMD confirms that several vitamins carry real anti-inflammatory potential. ^[6] The picture that emerges is not one magic pill — it is a nutritional foundation that either supports or undermines your body’s ability to manage fluid.

The Part Berg Gets Right and the Part You Cannot Ignore

Berg’s core argument — that nutrient deficiencies caused by a poor diet drive edema — is grounded in real physiology. The claim that cutting sugar and restoring B1, magnesium, and potassium can reduce swelling is plausible and consistent with how these nutrients work. ^[2] Common sense and basic nutrition science line up here. Cleaning up your diet is almost never a bad idea, and the downside risk of eating less sugar is essentially zero.

But swollen ankles are a symptom with many possible causes. Heart failure, kidney disease, blood clots, and certain medications all cause edema. ^[4] No supplement fixes those. If your legs swell suddenly, swell on one side only, or come with shortness of breath or chest pain, you need a doctor — not a YouTube video. Berg’s advice fits people whose swelling is driven by diet and lifestyle. It does not fit every person with puffy ankles, and treating it like a universal cure is where the advice gets dangerous.

The Practical Bottom Line

Start with food before you start with pills. Leafy greens, bananas, nuts, seeds, and whole grains deliver potassium, magnesium, and B1 in forms your body uses well. Cut the sugar and refined carbs that drain B1 in the first place. ^[2] If your swelling is diet-related, these changes can make a real difference. If it is not, no amount of magnesium will fix what is actually wrong. Know the difference — and when in doubt, get checked out first.