das Eiweiß
protein
A nutrient (protein) that is essential for building and maintaining body cells, muscles, and tissue.
Sportler achten oft auf eine Ernährung, die reich an Eiweiß ist.
Athletes often pay attention to a diet that is rich in protein.

protein / egg white
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protein
A nutrient (protein) that is essential for building and maintaining body cells, muscles, and tissue.
Sportler achten oft auf eine Ernährung, die reich an Eiweiß ist.
Athletes often pay attention to a diet that is rich in protein.

The word is made up of 'Ei' (egg) and 'weiß' (white) and literally means 'the white of the egg'. Since this part of the egg is rich in proteins, the meaning was extended to the nutrient protein in general.
Schlage das Eiweiß zu steifem Schnee.
Beat the egg white until stiff.
The context makes the meaning clear. If you are talking about cooking or baking, it refers to the part of the egg. If it is about nutrition, sports, or biology, it refers to the nutrient protein.
Für dieses Rezept brauchen wir nur das Eigelb, nicht das Eiweiß.
For this recipe, we only need the yolk, not the egg white.
When it is about the nutrient, typical formulations are 'reich an Eiweiß sein' (to be rich in protein), 'den Eiweißbedarf decken' (to meet one's protein needs), or 'Eiweiß für den Muskelaufbau benötigen' (to need protein for muscle building).
Quark ist besonders reich an Eiweiß.
Quark is especially rich in protein.
When it is about the part of the egg, typical verbs are '(vom Eigelb) trennen' (to separate from the yolk) and 'steif schlagen' (to beat until stiff). It is also often called 'Eiklar' (egg white).
Zuerst müssen Sie das Eiweiß vom Eigelb sorgfältig trennen.
First, you must carefully separate the egg white from the yolk.
protein
'das Protein' and 'das Eiweiß' mean the same thing when referring to the nutrient. Both words are used in contexts like nutrition, sports, or health. 'Protein' often sounds more modern or technical, while 'Eiweiß' is the normal everyday German term. What can be confusing is that 'Eiweiß' can also mean the white part of an egg. When it is about nutrients, 'Protein' and 'Eiweiß' are the same. When talking about an egg in cooking, 'Eiweiß' usually means egg white.

Linsen enthalten viel Eiweiß und machen lange satt.
Lentils contain a lot of protein and keep you full for a long time.
Nach dem Training isst Max einen Joghurt mit viel Protein.
After training, Max eats yogurt with a lot of protein.