Most people who have trouble gaining weight eat like birds

While it's true that metabolism plays a role in weight gain, it's not the only factor. Many who struggle to gain weight don't eat enough. They might eat like birds, but to gain weight, you need to eat like an elephant. But remember, it's not just about quantity, but quality too. Nutrient-rich food is key. If you're struggling, seek professional advice. It's not a one-size-fits-all situation.