Geeta Iyengar, in Yoga, A Gem for Women, sums up the proper diet according to Ayurveda as follows:
“A balanced diet, in moderation, is the best. Ayurveda says that the stomach should be filled with two parts of solid food and one part of water, and that one part of the stomach should be kept free for the movement of air. Food which is not congenial to the system should be avoided. Too oily, dry, spicy, and sour foodstuff are not good for the system. A diet which is balanced, light, varied, and well cooked is ideal for health.”
In other words, to be healthy, we should eat fresh, varied, well-prepared, tasty food. We should eat with sufficient awareness to know enough the effects of what we eat on our energy level, sleep, digestion, and ability to move and think that we know what is good for our system in small, large, or any quantities (and eat mindfully in accordance with that knowledge). We should not eat to the point of fullness and beyond (this is a common suggestion in the West for losing weight, i.e., stop eating when you are full or right before — think getting away from the unrealistic American portion size). Any other dietary practices should serve to find this place of moderation and enjoyment, the two real keys to health and happiness with and in eating. Diets that take us away from balance will be hard to follow, unhealthy, and cause all sorts of other shifts in our mind-body. What is best for you depends on your own knowledge of yourself and your environment.