These Healthy Foods Can Actually Dehydrate You, Experts Say

VoM News Desk | January 27, 2026 | 10:52 AM IST | Featured by VoM, Health, Health Care | Follow on Google News

These Healthy Foods Can Actually Dehydrate You, Experts Say

Studies show that some healthy foods can increase urine output, sweat loss, or intestinal water draw, resulting in 500–700 mL of additional daily fluid needs within a 24-hour period.

An expert from Instant Hydration analyzed nutritional data to identify healthy foods that can raise daily hydration requirements.

Jalapeños | Capsaicin-Lead Sweat Loss

• ~10–15 mg of vitamin C per raw jalapeño supporting the immune system; capsaicin blocks substance P, reducing pain signaling and increasing metabolic rate by ~4.5%.

The expert warns, “Capsaicin actually turns on TRPV1 heat receptors; thereby, the body temperature goes up, and so does sweat production. Research indicates that sweat loss can go as high as 30%; thus, the risk of dehydration will increase if no additional fluids are consumed.”

Tomato Soup | Hidden Sodium Impact

• Providing up to 80% DV of lycopene and about 28% DV of vitamin C, cooked tomatoes help reduce oxidative stress and inflammation by 20–40%, support immune defense, and protect heart health.

“Store-made tomato soups have 400–900 mg sodium per serving, which causes an osmotic imbalance and the volume of urine to increase by 10–20% in the short term. Even if the soup is rich in liquids, too much sodium lowers the water supply to the cells, thus resulting in thirst and bloating,” the expert warns.

Spinach | Natural Diuretic

• Rich in vitamin K, folate, iron, and potassium, all of which play key roles in circulation, cellular metabolism, and electrolyte balance.

The expert informs, “Spinach has asparagine, which is a substance that increases glomerular filtration rate (GFR), so the urine level increases by 10-12% in the case of big servings. The impact, in fact, can double or even triple if one is fasting, doing an intense workout, or is sick.””

Overripe Bananas | Potassium & Osmotic Load

• As bananas ripen, 70–90% of resistant starch converts into simple sugars (glucose, fructose), making them easier to digest.

The hydration expert points out that “high potassium (490 mg per banana), along with sugar, can significantly increase renal water excretion; this effect is mostly observed when sodium intake is low, thus leading to net fluid loss.”

Dry Chia Seeds | Intestinal Fluid Absorption

• Chia seeds are loaded with omega-3 fatty acids, fiber, and a plant-based protein, all of which are good for the heart, aid in digestion, and provide energy that lasts for a long time.

“During digestion, dry chia seeds have the capacity to take in up to 12 times their weight in water; thus, they pull water into the intestines and lower the overall hydration level of the body if the diet is low in fluids. Therefore, soaking chia seeds is important if one wants to keep hydration levels intact,” the expert firmly advises.

Expert Final Note

“Water is not the only factor when it comes to hydration. It is also about the amount of water that your diet requires without you noticing,” says the expert of Instant Hydration. “Foods that make you sweat more, urinate more, or absorb water from the intestines must be accompanied by a definite intake of fluids.”

VoM News Desk

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