Cheese, cream and butter used in some breads on the market are high in saturated fat. Some breads will contain higher calories because of the addition of salt, sugar and cooking fat in the process of making them.
Hard and soft breads add ingredients such as eggs, sugar, milk, and fats, only the amount of water added differs. "Toast bread," "butter bread," and most fancy snack breads are soft breads. Soft sweet breads contain about 15 percent sugar and 10 percent fat, and toast breads a little more.
Additionally, bread is often eaten with butter or jam, which is even more fattening.
From the calorie point of view, to the surface of the dry crust of the crisp bread calorie minimum, because this kind of bread is not sweet, containing sugar, salt and fat are very little, after baking the surface of the crust is crisp and hard, eat while hot is very tasty. French staple bread and Russian "big Lebas" belong to this category, the nutritional value and buns are generally similar.
Also, your question is ambiguous! Perhaps you are asking why bread is fat?
That's because some breads are yeast-fermented and become fluffier and softer during the baking process.O(∩_∩)O