Many people feel full after just a few bites, find the smell or sight of food unappealing, or start avoiding meals with others because eating feels like a chore.

So, what's going on?

According to the National Institutes of Health (NIH), changes in appetite can result from hormonal imbalances involving two key hormones: leptin and ghrelin.

Leptin, produced in fat tissue, signals the brain to suppress hunger, while ghrelin, released in the stomach, stimulates appetite.