I highly doubt that eating one meal per day or limiting yourself to a window of time per day for eating will harm anyone. I think we all eat too much already. But, like anything else, too much of a good thing can always turn into something bad. As long as you’re not going to extremes you’ll probably be okay.
But, like any diet, intermittent fasting can give rise to extreme eating habits. Twitter CEO Jack Dorsey, who subscribes to a fasting routine, eats a single meal on weeknights followed by a weekend-long deficit — what some nutrition experts consider a sign of an eating disorder.Business Insider
In some cases, the negative side effects of fasting could outweigh any potential benefit.