Zack was diagnosed with obstructive sleep apnea (osa). his doctor may include diet and exercise as part of his treatment regimen because:

because losing weight may reduce his OSA symptoms.

Explanation:

Obstructive sleep apnea is a respiratory arrest caused by collapse of the pharyngeal walls. The disorder occurs mainly while the person is sleeping and snoring. To be more accurate, during seizures, she stops snoring because of the blockage of air passage through the pharynx. Repeated episodes of apnea result in less oxygenation of the blood, which can result in damage to the body.

One of the causes of obstructive sleep apnea is obesity, or overweight, so it is common for doctors to ask patients under these conditions to diet and exercise as part of their treatment.