Exactly. I'm a big proponent of fasting which is why reddit's fasting subreddit being 100% about weight loss bugs me so much. I've been jogging well into pretty extended fasts. Meanwhile people insist that it's impossible to even walk a straight line if you miss one single meal a day.  It's just insane. As you say, our hunter gatherer ancestors weren't breaking out a table and silverware to eat three meals a day every day. We'd be extinct if our species couldn't be very active while lacking in food.