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It depends on the type of bread. French baguettes are extremely low in fat, as there is no fat added to the dough. Ordinary white and wheat breads are low in fat, but they do contain some fat. Breads like brioche are much higher in fat.
carbohydrate
Substitute margarine for butter and applesauce for oil.
Melted fat from any fowl, or use refined coconut oil, it has no flavor.
Eggs
unsweetened applesauce
All fats can be removed from bread formulas and recipes; very good bread can be made with nothing more than flour and water, yeast and salt. Fat-free breads will have different tastes and textures than breads with some sort of fat, but they will still be proper bread.
why the exchange of fat-containing foods with fat-substitute-containing foods would not be ideal for a marathon runner
You can use white or brown breads, whole grain breads, or sliced buns for a sandwich.
Evaporated milk mixed with equal parts water. Reconstituted powdered milk. Soy milk. There are probably others but it would depend on what you plan to use the milk for and why you want a substitute. If you just don't want the milk fat, use skim milk. If it's for a recipe where the milk fat is needed for the recipe to work, there might not be a substitute.
More excercise and watch what you are eating, no fat or oil, reduced pastas, breads and desserts
commercial breads containing flaxseed