Question

if matthew wants to lose 20 lbs, what must he do?
seguir una dieta mal balanceada.
seguir una rutina.
seguir una dieta balanceada.

Explanation:

To lose weight, a balanced diet is crucial. A balanced diet provides necessary nutrients while controlling calorie - intake. An unbalanced diet won't help with weight loss. Just following a routine without proper diet is not sufficient for losing a specific amount of weight.

Answer:

Seguir una dieta balanceada.