Some preliminary evidence suggests that more energy is used to process a meal when it’s eaten in the morning, compared with later in the day, so you burn slightly more calories if you eat earlier. However, it’s still unclear how much of a difference this would make to overall body weight.
Another possibility is that late-night eating extends the overall window during which food is consumed. This gives our digestive systems less time to recuperate and reduces the opportunity for our bodies to burn fat – because fat-burning only occurs when our organs realise that no more food is coming their way.
http://www.bbc.com/future/story/20190304-how-meal-timings-affect-your-waistline