In Ayurveda, food is the first and the most frequently mentioned form of treatment. The classical texts devote long chapters to what to eat, when and how, and they give diet and digestion a central place in keeping a person well. This section explains those ideas, as the tradition states them.
The foundation is the doctrine of the six tastes (rasa): sweet, sour, salty, pungent, bitter and astringent. The tradition teaches that each taste has typical effects on the doshas, that a meal should usually contain all six, and that an excess of any one is unhelpful. Sweet, sour and salty are said to increase kapha and calm vata. Pungent, bitter and astringent are described as lightening and drying. Foods are also classed by their qualities, such as heavy or light, oily or dry, and by whether they are heating or cooling in effect. These are traditional categories. They do not correspond to the measured temperature or chemistry of the food.
The second idea is agni, the digestive fire. The texts treat a strong, regular appetite as a sign of good health and a weak or irregular one as the root of many troubles. Much dietary advice is aimed at looking after agni: eating when hungry, taking warm and freshly cooked food, avoiding overeating and leaving gaps between meals.
The third idea is food combining. The tradition names some pairings as incompatible (viruddha ahara), such as milk with sour fruit or fish with milk. Modern nutrition research has not confirmed these rules, and we will say so plainly when we describe them. They are a part of the tradition worth understanding, not a list of dangers.
Finally, the kitchen itself is part of the system. Everyday spices such as cumin, coriander, fennel, turmeric, ginger and asafoetida are used in cooking partly for taste and partly for their traditional digestive effects. The guides here will explain how they are used in food and where the claims come from.
Food is also where good intentions can go wrong. A traditional diet can be unsuitable for someone with a food allergy, diabetes, kidney disease, an eating disorder or pregnancy, and a plan for losing or gaining weight is a matter for a doctor or dietitian. Nothing in this section is a diet plan or treatment. Please read our medical disclaimer before changing how you eat.