Sometimes eating often boosts the metabolism, but you still have to eat mostly good stuff not junk all day, also could be thyroid issues. I had a friend who could eat literally garbage all day long and was skinny as a rail. Turned out he had hyper thyroid issues and it's not a healthy thing.
I used to be like 350 pounds, now I am probably like 190, you gotta find what works for your body. Mine it turns out too many carbs, I have to have some carbs all day long but small amounts with lots of veggies and lots of protein. I eat constantly but I burn a lot of calories too.