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Cooling and heating foods, decoded

Curd is cooling, mango is heating, and everyone's grandmother has a list. It is one of the deepest beliefs in Indian food. Here is what the science says, and why the old wisdom still works even when the temperature part does not.

Reviewed by the editorial desk Last reviewed: July 2026 · 7 min read

The short answer

The idea that foods are "heating" (garam) or "cooling" (thanda) comes from Ayurveda's concept of a food's potency, and it runs deep in Indian life. Taken literally, it does not hold: your body guards its core temperature tightly, and no food meaningfully warms or cools it. Read as temperature, it is not supported. But read as practical wisdom it often works, because "cooling" foods tend to be watery and light and "heating" foods rich, dense or warming-spiced, which genuinely suit summer and winter. We keep the framework as heritage, and rate the temperature claim on the evidence.

Almost every Indian household runs on this map of food. Eat curd and cucumber in summer; take ghee, nuts and dry ginger in winter; do not give a feverish child a mango. It is intuitive, comforting and near-universal. It also deserves an honest look.

What the tradition says

In Ayurveda every food has a virya, a heating or cooling potency, that shapes how it acts on the body. The lists are remarkably consistent across households: cooling foods include curd, milk, cucumber, watermelon, coriander, fennel, sattu and coconut water; heating foods include ghee, nuts, sesame, mango, ginger, garlic, eggs and jaggery. The framework is used to guide eating by season, by climate and by a person's constitution, and it is one of the oldest organising ideas in Indian food.

What science actually finds

Here the literal claim runs into biology. Your body is a careful thermostat: it holds its core near 37°C whatever you eat, sweating or shivering to correct even small changes. No ordinary food shifts that in the way the folklore suggests. There is a real effect called the thermic effect of food, digesting a meal burns a little energy, most of all for protein, but it is tiny and applies to all food, not to a special "heating" category. And chilli, the classic "heating" food, is revealing: its capsaicin makes you feel hot and sweat, which is the body's way of cooling down. So the sensation of heat is real; a rise in core temperature is not.

Where the wisdom still holds

Strip away the thermometer and much of the advice is quietly sound, just for different reasons.

"Cooling" foods

Often watery and light, curd, cucumber, melon, coconut water, which genuinely hydrate and sit easily in the heat. Good summer advice, for hydration not temperature.

"Heating" foods

Often rich, dense or warming-spiced, ghee, nuts, sesame, ginger, which comfort and satisfy in cold weather and align with what is in season. Sensible winter eating.

Some of the specific pairings have real effects too, just not thermal ones: fennel and coriander soothe digestion, ginger settles the stomach, and watery fruit in summer really does help you cope with heat. The tradition arrived at good seasonal habits by feel; the reasons turn out to be about hydration, digestion and what grows when, not body temperature.

Where to let it go

The one place the belief can do harm is when it leads people to cut out nourishing foods out of fear, avoiding eggs, mango or nuts as "too heating," or denying a sick person good food. There is no evidence a nutritious food harms you by being "heating." If a specific food genuinely disagrees with you, that is worth respecting as your own experience. But do not let a temperature label push a healthy food off your plate. Enjoy the framework for the sound seasonal rhythm it encodes, and hold its literal claims lightly.

This is educational content, not medical advice. Traditional dietary frameworks can carry real practical wisdom while their explanations differ from modern physiology; we try to honour the first and be clear about the second.

In one minute

Your body holds its core temperature tightly; no food heats or cools it as the folklore says.
The advice still works because "cooling" food is usually watery and light and "heating" food rich and warming, good seasonal sense.
Do not cut out nourishing foods like eggs, mango or nuts just for being labelled "heating".

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