Which person engages in habits that are most harmful to his or her health? Martina eats nutritious food, avoids physical exertion, and enjoys spending time with friends. Mathew skips meals, sleeps an irregular number of hours, and smokes cigarettes daily. Alexa is captain of her soccer team, is careful about what she eats, and has a family history of diabetes. Jason is self-conscious about his weight. He tries hard to control his diet but can’t help overeating sometimes.