Those formulas have the appeal of simplicity, but it's more complicated than that. For starters, caloric burn is highly correlated with caloric intake. They're not independent variables by a long shot. Consume less and your metabolism will actually shift down to burn less. Burn more by exercise and your appetite will increase to partially compensate.
Also, exercise is actually a low load on our body calorically (for most types of exercise). The overwhelming majority of calories burnt are for maintaining homeostasis, and have nothing to do with aerobic exercise.
Here's an example that shows how people are deceived. If you're an average male, and you start using a high-tech treadmill, the calories/hour measure might say something like "120 calories/hour". Sounds great, right? Well, what it doesn't say is that 100 calories of that measurement are just due to your basal metabolic rate, the amount you would burn just sitting in a chair. Running (possibly the most efficient exercise) itself only burnt 20 calories an hour. A carrot is sufficient to cover that.
Plus, exercise is not the only output. Heat production is an even better one. The amount of calories expended in maintaining body temperature is way higher than exercise. There's also excretion, but luckily, nobody's advocating laxatives as a weight-loss regimen yet. :)
Also, exercise is actually a low load on our body calorically (for most types of exercise). The overwhelming majority of calories burnt are for maintaining homeostasis, and have nothing to do with aerobic exercise.
Here's an example that shows how people are deceived. If you're an average male, and you start using a high-tech treadmill, the calories/hour measure might say something like "120 calories/hour". Sounds great, right? Well, what it doesn't say is that 100 calories of that measurement are just due to your basal metabolic rate, the amount you would burn just sitting in a chair. Running (possibly the most efficient exercise) itself only burnt 20 calories an hour. A carrot is sufficient to cover that.
Plus, exercise is not the only output. Heat production is an even better one. The amount of calories expended in maintaining body temperature is way higher than exercise. There's also excretion, but luckily, nobody's advocating laxatives as a weight-loss regimen yet. :)