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:

A balanced diet is essential for weight - loss as it provides the necessary nutrients while controlling calorie intake. A routine (without specifying a healthy one like exercise and diet routine) is too vague. A mal - balanced diet would likely not help in weight - loss.

Answer:

Seguir una dieta balanceada.