An obese individual is suffering from arterial hypertension and diabetes. The medical practitioner referred the patient to the nutritionist to lose weight because it can help to control hypertension and diabetes and their complications. The nutritionist explained to the patient that he should restrict the input of kilocalories (calories) and gave him a table with the number of calories that some essential nutrients provide. Which of them is incorrect? Select one: a. Carbohydrates: 4 kcal per gram b. Protein: 4 kcal per gram c. Fat: 9 kcal per gram d. Minerals: 2 kcal per gram