1st QUESTION: What does biology require to reduce fat mass?

Increase caloric intake to gain mass
Change macronutrients without caloric deficit
Establish a caloric deficit that causes more energy to be expended than that ingested
Reduce physical exercise only

2nd QUESTION: What should calorie cutting look like?

Apply the same reduction to all people
Complete elimination of fats from the diet
Reduce calories without assessing morphology or sport
Personalize the cut according to individual requirements by evaluating morphology and sporting demands

Sustained negative balance of three thousand five hundred calories in seven days
One hundred calories in a week
Twenty thousand calories in seven days
No caloric deficit required