An article by John Cloud, Why Exercise Won’t Make You Thin on Time.com misses the point of why exercise is important. It is true that exercise only burns an infinitesimal number of calories. If you are into the calories in, calories out frame of mind, you will need to exercise for 10 hours to cover a Big Mac. 20 minutes of jogging barely covers a small chocolate chip cookie. It isn’t even a matter of converting fat to muscle: if you converted 10 pounds of fat to muscle, you would be able to burn an extra 40 calories a day, which isn’t that much. No, the reason to exercise is metabolic, and you need to match that with metabolic eating.
Say you eat an apple which is all sucrose and some fiber. Half of sucrose is glucose and 76% of that burns off at the first pass while 24 % of it goes into the liver where most of it is stored as glycogen and the rest powers mitochondria for energy. Maybe a half a calorie goes through the TCA cycle which will turn into VLDL cholesterol, used to store fat. The other half is fructose of which 72% goes into the liver. The breakdown products of this fructose in the liver is far more pernicious, including uric acid which causes gout and hypertension, but more importantly Continue reading Time Article Misses the Point of Exercise in Weight Loss