Intermittent fasting and meditation
Hindus and Buddhists fast to increase self-discipline (being hungry but not reacting), concentration and mindfulness, it’s also for purification. This article is incredibly good in terms of fasting and how it improves cognitive functions, longevity, better immune system, and weight control. This article is also very good in terms of its explanation on the three stages of fasting, i.e. the crisis stage of where the body uses it’s own resources to remove toxins from the body, then the fasting peak and lastly the normal fasting state.