Purely from the point of view of performance during and next day it needs to be carbohydrate before during and after.
Carb meal night before, carb meal 2hrs before, small carb snack 30mins before,90gr per hour during, recovery or full fat coke within 15m of finishing (window of max carb uptake for muscles) and large carb meal within 2hrs.
Not exactly a weight loss programme except fat should be minimised as it prevents uptake of carbs by lining stomach. Lean meat is fine