How to Say "metabolism" in Spanish
The Spanish word for “metabolism” is “metabolismo” — B1 level. This is a very common word in everyday Spanish.

Examples
Tengo un metabolismo muy rápido.
I have a very fast metabolism.
Hacer ejercicio ayuda a activar el metabolismo.
Exercising helps to activate the metabolism.
Ciertas enfermedades pueden afectar el metabolismo de las grasas.
Certain diseases can affect the metabolism of fats.
It's a masculine noun
Since it ends in '-o', it is almost always masculine. You should use 'el' or 'un' with it.
Using it with 'tener'
Just like in English, we use the verb 'tener' (to have) to describe the type of metabolism someone has.
Confusing it with digestion
Mistake: “Mi metabolismo es malo porque me duele el estómago.”
Correction: Mi digestión es mala porque me duele el estómago. (Metabolism refers to how your body uses energy, while 'digestión' refers specifically to processing food in the stomach.)
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