(This analysis is based on 5 min of chat + some brief email exchange, not a lot of data.) My perception of him affects my perception of my son and many overweight friends in my circle.

Deepak said compared to diet, exercise is relatively easy because he can do about 1H of exercise everyday. I tend to dismiss Deepak’s claim on exercise. Perhaps he was doing relatively light exercise, perhaps for 1H each day for a few months. Reality is…

• ! Very few individuals (perhaps 1~3%) can achieve those targets that Deepak did.
• .. perhaps grandpa, with his strong self-management, could at age 40 achieve something slightly higher than that. I’m not better than Deepak. I couldn’t do 30min every day.
• even if this demanding workout regime is not maintained for a year, there’s a still a non-trivial health benefit for the overweight individual, in terms of weight + various organs
• Arguably the biggest under-rated benefit is … self-confidence, self-esteem, self-regulation, determination,