Originally Posted by mm84321
Diet, by affecting and impacting activity levels, will make you fit. I wholeheartedly disagree with you here, Gib. I would say that diet plays the most pivotal role in the improvement and treatment of health problems. The beneficial effects of activity and exercise on health are surely important, but, as I've stated, the diet is what's directly impacting how much activity you chose to do in the first place. A deficient diet cannot be replaced by running on the treadmill. Nutrition is the most essential factor.
I can't really take this argument seriously when you're trying to say that eating well is causative for activity. What possible evidence do you have to support this? A person who is fundamentally physically lazy, dislikes activity, has no appreciation or experience with sport, etc, is not suddenly going to start playing sports, running, and hitting the weight room simply because they have a spot on diet. If you're already inclined towards those activities, and have time, then sure you're going to be more apt to do them if your diet is good. Even then I'd say going from "good" to "excellent" wouldn't have much effect. But it's crazy to say that it's causative. Again let's be clear about what we mean by diet. You can have a diet that provides 100% of your requirements, and not be especially lean, if you're consuming too many calories. It is not "deficient" in anything, and the person's health is not going to suffer from the lack of leanness unless they push it too far and become seriously overweight or obese. There's no solid evidence that extremely lean people have better long term health (somewhat the opposite in fact), but there's substantial evidence that active people have much better health outcomes. Activity increases muscle mass, increases bone mass and strength in aging people, improves mood, improves heart and lung function, etc. You need a good
diet to be able to work out effectively, but you can't get those things just by diet, even with a perfect diet. Obviously a perfect diet AND activity would be ideal.