To celebrate turning 80, I went on my first fast.
No food, tea or coffee. Just water. For the first few days it was hell, but the after-effects have been very positive. It's said that fasting can help with diabetes and Alzheimer's.
Rishi Sunak fasts for only 36 hours a week. My fast was meant to last for ten days, but my naturopath (or natural-health practitioner) saw that, after four days, I was in such discomfort and so weak that he weaned me back on to food