why is inactivity a primary risk factor for many different diseases?

Answer 1

As someone grows older and slows down to large degrees of inactivity, so does their metabolism. This is where the body physicially changes: enter the wider "girth"--inching obesity, which can cause health risks.

It's akin to a sort of domino effect from there: high blood pressures can develop, the muscles weaken--inculding the heart, which too is a muscle that can benefit from exercise so to ward off attacks when can degenerate muscle tissue......leading one to death if not careful.

Answer 2

Inactivity contributes to obesity, which leads to diabetes and heart disease. Inactivity causes poor cardiovascular fitness, which lowers the body's ability to adapt to illness. In a specific sense, extreme inactivity (bedridden, for example) can lead to pressure ulcers on the skin, which can become fatal. Inactivitiy can contribute to forming blood clots.

Answer 3

Our bodies weren't created for a sedentary life. Even if you believe God created the human being or you believe in evolution (or both) you'll see that our bodies were made for daily activity. We weren't meant to be in front of a computer for hours (or in front of a TV). In the past, people had to look for food, shelter and keep doing things to survive. Now we have delivery, drive-thru, we work in offices, sitting for hours. Then, at the end of the day we are too tired to exercise or eat properly. When the body is inactive,everything slows down: your metabolism, your body's ability to repair itself (our bodies are in constant repair) and starts behaving like in a hibernation state (instead of using the food you eat,your body storage it).That's why it leads to so many diseases like obesity, cardiac diseases, osteoporosis, etc.