Shundo David Haye – Zen Priest

‘Do not eat anything alive, hard, or spoiled. Such impure foods will make your belly churn and cause heat and discomfort of bodymind, making your sitting difficult. Do not indulge in fine foods. It is not only bad for your body and mind, but also shows you are not yet free from greed. Eat just enough food to support your life and do not be fond of its taste. If you sit after eating too much, you will get sick. Wait for a while before sitting after eating big or small meals. Monks must be moderate in eating and hold their portions to two-thirds of what they can eat. All healthy foods, sesame, wild yams and so on, can be eaten. Essentially, you should harmonize bodymind.’ (Zazen Yojinki)

Dogen also wrote a whole piece about the dharma of taking food. Along with other admonitions in this text by Keizan, being mindful of food is the kind of practice we can always do three times a day.