[maloney]

Yes, eating too much food can cause weight gain. That is also the simplest and least helpful view that exists. It certainly does not explain how some people can gain weight with a calorie deficit and some people can loose weight on a calorie surplus.

By the way "skipping meals" (aka fasting) is exactly what Dr. Fung recommends to lose weight. Fasting drops your insulin levels and gives your body a chance to burn its stored fats.