"Eating before bed causes weight gain and obesity, while eating during the day does not cause obesity because the body burns it" The answer is that this claim is false, and there is no correlation between eating timing and obesity. If you feel hungry before bed, don't starve yourself and eat a protein-rich snack like light tuna slices or boiled eggs, this will help you sleep.
For some people who suffer from heartburn, eating before bed may cause heartburn and may negatively affect their sleep.