Does our diet have an impact on sweating?

Sweating is above all a thermoregulation mechanism that prevents the body from overheating. When internal temperature rises, whether due to physical exertion or a hot environment, the brain activates the sweat glands distributed across the skin. As sweat evaporates from the surface of the epidermis, it removes excess heat, thereby helping to maintain a stable body temperature, ideally around 37°C (98.6°F). Keeping this temperature more concretely allows our body to function properly.

However, beyond external heat, our internal metabolism also produces a constant amount of thermal energy, especially during digestion. This phenomenon, called diet-induced thermogenesis, corresponds to the energy the body expends to break down, absorb, and store nutrients. Depending on the type of foods consumed, this metabolic effort is more or less intense, which can activate our sweat glands even at rest. Sweating then becomes a direct reflection of our internal activity and of the complexity of the molecules we choose to ingest.

The influence of diet on sweating is largely based on diet-induced thermogenesis, that is, the heat produced by the body during digestion.

This energy cost varies considerably from one nutrient to another. Proteins, for example, require a much greater metabolic effort to be broken down than fats: they can account for an energy expenditure of up to 20 to 30% of their own caloric value, compared with only 0 to 3% for lipids. A diet very high in protein, for instance one rich in red meat, therefore raises the body’s internal temperature more markedly, forcing the thermoregulatory system to activate in order to dissipate this digestive heat. Conversely, cold preparations or meals divided into small portions help smooth out this thermal impact and limit postprandial sweating spikes.

A recent study conducted in Sweden on 336 participants has highlighted interesting correlations between our consumption habits and hyperhidrosis, which corresponds to excessive sweating. The researchers compared a group suffering from severe sweating of the hands and armpits with a control group. The results show that individuals prone to heavy sweating consume significantly more caffeine on a daily basis. Even more striking: 57% of participants with hyperhidrosis consume energy drinks every week, compared with only 39% in the group without specific disorders. The study also emphasizes that spicy foods, as well as fatty foods, fast food, and sweets, are identified by patients as direct triggers of their sweating episodes.

This link with caffeine is not a coincidence. By stimulating the central nervous system, it boosts the release of adrenaline and increases the body's baseline temperature. This makes the sweat glands more reactive and promotes the sweating mechanism. In addition, substances such as capsaicin, found among other things in chili peppers, trick the brain: they activate the heat receptors in the mouth, sending a false “overheating” signal that triggers immediate sweating, known as gustatory sweating, to cool the body down.

Finally, the Swedish study highlights a frequently overlooked consequence: the difficulty of compensating for fluid losses. Women suffering from excessive sweating report greater challenges in maintaining adequate hydration, and an increased sensation of thirst is the most frequently cited symptom among all patients. To limit these issues, beyond reducing stimulants such as coffee or ginger, it is recommended to favor foods with a low thermic effect, such as fresh vegetables, lean white meats, and fruits with a high water content. These foods help nourish the body without triggering the intense metabolic effort that precedes the activation of the sweat glands.

Perspiration is therefore not only related to physical exercise or environmental heat, but also to the foods we consume.

While sweat is naturally odorless, it nonetheless provides a fertile environment for bacteria which, by breaking down organic molecules, generate body odors.

Now, our food choices act directly on this process. A study conducted in 2017 showed that men with a high intake of fruits and vegetables produce sweat that is perceived as significantly more pleasant, with notes described as floral, fruity, and sweet. This correlation appears to be linked to carotenoids, antioxidant pigments that are found in large amounts in carrots, tomatoes, and spinach. The higher the level of carotenoids measured in the skin, the more sweat is perceived as “healthy” and attractive by others.

Conversely, other food groups appear to weigh down this olfactory signature. Research suggests that excessive intake of refined carbohydrates—found in white pasta, white bread, and pastries—is often associated with stronger, less pleasant-smelling sweat. As for proteins, the data are more nuanced: while high consumption of red meat has traditionally been suspected of making body odor more intense and acrid, some studies indicate that moderate intakes of eggs or tofu do not necessarily worsen the smell of sweat. The problem often lies in overconsumption and in the body’s difficulty processing certain metabolic byproducts.

Finally, we should not forget direct olfactory “markers.” Certain sulfur-containing compounds found in garlic, onions, or some cruciferous vegetables, such as broccoli, are not completely broken down during digestion. Their metabolites circulate in the bloodstream and are ultimately excreted through the pores, temporarily altering our scent trail. To maintain a neutral and fresh sweat, the key appears to lie in a plant-rich diet, which allows carotenoids to “naturally perfume” our epidermis.

• STEPHEN I. D. & al. Diet quality and the attractiveness of male body odor. Evolution and Human Behavior (2017).

• STOCKLER-PINTO M. B. & al. Hyperhidrosis and diet-induced thermogenesis. Hyperhidrosis (2020).

• BARNES K. A. & al. Explaining variation in sweat sodium concentration: Effect of individual characteristics and exercise, environmental, and dietary factors. Journal of Applied Physiology (2022).

• WALDRON M. & al. The effect of dietary supplements on core temperature and sweating responses in hot environmental conditions: A meta-analysis and meta-regression. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology (2024).

• SAMUEL V. T. & al. A high-protein diet for reducing body fat: Mechanisms and possible caveats. Nutrition and Metabolism (2024).

• SHAYESTEH A. & al. Food and beverage habits among individuals with primary hyperhidrosis: A case-control survey in Sweden. Dovepress (2025).