Exercise Is One of the Best Preventive Medicines
A key health benefit of exercise is that it helps normalize your glucose, insulin, and leptin levels by optimizing insulin and leptin receptor sensitivity. This is a crucial factor for optimizing your overall health and preventing chronic disease, and may explain why exercise is such a potent preventive medicine. In fact, researchers recently suggested that exercise is “the best preventive drug” for many common ailments, from psychiatric disorders to heart disease, diabetes, and cancer.
Researchers found that exercise reduces the risk of about two dozen health conditions, ranging from cancer and heart disease to type 2 diabetes, stroke, dementia, and depression. Exercise also slows down the rate of aging itself, providing perhaps the closest example of a real life fountain of youth as we will ever find. Besides optimizing insulin/leptin receptor sensitivity, other beneficial biochemical changes also occur during exercise, including alterations in more than 20 different metabolites involved in fat burning and metabolism, among other things. This includes changes in your:
Muscles, which use glucose and ATP for contraction and movement. Tiny tears in your muscles make them grow bigger and stronger as they heal. Gaining more muscle through resistance exercises has many benefits, from losing excess fat to maintaining healthy bone mass and preventing age-related muscle loss as you age. The intensity of your resistance training can achieve a number of beneficial changes on the molecular, enzymatic, hormonal, and chemical level in your body.
Lungs. As your muscles call for more oxygen, your breathing rate increases. The higher your VO2 max—your maximum capacity of oxygen use—the fitter you are.
Heart. Your heart rate increases with physical activity to supply more oxygenated blood to your muscles. The fitter you are, the more efficiently your heart can do this, allowing you to work out longer and harder. Your blood pressure will also decrease as a result of new blood vessels forming.
Joints and Bones. Exercise can place as much as five or six times more than your body weight on them. Weight-bearing exercise is one of the most effective remedies against osteoporosis, as your bones are very porous and soft, and as you get older, your bones can easily become less dense and hence, more brittle — especially if you are inactive.