Hey its Soup
Yeah we swimmers have notoriously bad running shoes and generally fracture our feet before we ever get winded.
You probably dont need a lot of carbs because it sounds like you're running long distance. Science behind it is your body starts any exercise using glycogen store, which is about 3000 calories worth. Then, soon as glycogen stores get low, fat stores kick in. It doesnt take 3000 calories before fat kicks it. The more trained your muscles are, the sooner it kicks over to fat stores. For a conditioned runner it happens pretty fast. If you're sprinting, a few days of carb loading would be good tho. Not necessarily spaghetti.
And the thing about carbs was 1 gram of carbs absorbs 3 grams of water, so you get get the gut sloshing a lot with carb loading.