Proteins play a major role in muscle building. With good reason, because your muscles are made up of protein building blocks called amino acids. If you do not take enough protein, your muscles will break down: So you lose muscle mass.

Even under low physical strain, your muscles need proteins to regenerate. Therefore, a protein-rich diet is the basis for muscle building. Protein-rich foods are among others:

• Fish
• Meat
• Legumes
• low-fat curd

The good news is that fat doesn't necessarily make you fat. If you eat the right fats, you will give your body, especially your muscles, a training advantage. You should avoid fatty acids and trans fatsthat lurk in chips, sausage, fast food and convenience foods. Good fats include the polyunsaturated fatty acids. And you can find these for example in:

• Avocados
• Nuts
• Fish (e.g. salmon)
• Vegetable oils such as rapeseed oil

Energy source number one is carbohydrates. They are involved in almost all metabolic processes. That sounds quite good – actually. Unfortunately, there is a catch: we store carbohydrates in depots. If these are not completely emptied, the body converts the excess into fat and stores it.

Therefore you should not overdo it with the diligent energy suppliers. But it's not only a question of "how much", but also of "what". If you reach for complex carbohydrates, you can boost your muscle build-up with your diet without simultaneously filling your fat stores. Because the body absorbs complex carbohydrates slower than simple carbohydrates. Complex carbohydrates are mainly contained in the following foods:

• Whole grain products (e.g. whole grain oat flakes, bread, pasta)
• Legumes
• Fruits and vegetables

Caution is required with regard to the "bad" carbohydrates, which are contained in large quantities in white flour products, sweets and convenience goods. Their relatively high sugar content makes your blood sugar level shoot up quickly.