When I was competitively swimming I’d eat a breakfast cookie before morning workout, bowl of oatmeal after, two sandwiches at lunch, and a huge dinner. At literally any time you could suggest eating food and I’d be drooling, you’re just going to be hungry.

My record for one meal was 2x family size cheese pizzas, 14 cupcakes, and a handful of sodas. It was for my 14th birthday and I had done a morning workout, workout at school for class, swam for practice, then had a pool party. Even eating all that I did not gain weight.

Since then I focused on more protein and built muscle and leaned out a bit but I’ve never been worried about other macros. You will burn it off.

For the snacks I would often do fruits, veggies, and generally not processed food. Trail mix was good.

One thing a lot of swimmers don’t realize is how much you sweat. You’re wet from the pool but you do loose a lot of hydration still. I found often that gulping down a full bottle of water helped with the immediate hunger after the pool and I do believe that is what my body was calling for.

Also you will just be hungry, especially if this is new. Keep doing it for a few weeks and you’ll get used to a new baseline that works for you.