It is the old saying 'diet and exercise', is all you need to create change in your body and cut body fat. It is true.......to an extent. Exercising does consume energy and restricting your diet or being more careful about what you eat gives you greater control as to whether your body creates or 'burns' net adipose tissue. The problem I have with exercise is this: It doesn't burn that much energy!!!! Ok let me explain:
As an adult your Metabolic Rate may be anywhere between 1800-2200 calories (on average). ie. The amount of energy you will utilise in a day without exercising.
Now if you run a MARATHON: You will use 2600 calories (once again just an average) but you get the idea. But wait.....a marathon may take the average runner 3 or 4 hours to complete, so if you subtract what energy you would have used ANYWAY, about (360), you are left with a 'profit' of 2240 calories burned from your run. So in other words, according to the calorie in - calorie out model, your best case scenario is to get a 2200 calorie buffer for your day from a massive investment of both time and effort.
But wait, there is more.....You will probably be advised to 'carb load' for your marathon to give you the energy to get through it. So that is already starting to eat into that caloric buffer you have achieved.
Now let's look at a more realistic scenario, say you go for a 30 min jog. You will burn an extra 400 calories at best. Now let's not forget to minus this from what we would have burned anyway and our best case scenario (factors such as weight and fitness will determine how much energy you use) is around about a 350 calorie buffer, which if you analyse the caloric content of many foods works out to be not a whole lot.
Now this works if you don't eat more as a result of exercising. But don't forget 'Reward eating' is very common as your energy requirements increase. If all dietary components are kept constant I am all for exercise. But quite often as a result of exercising many people believe that they have 'earned' a chocolate bar, which obviously completely counteracts the original idea and often has the opposite effect.
Long story short, Exercise IS NOT the answer. It is a tool that if you used correctly, may improve fat loss, but it is not a crutch and should not be used as an excuse not to eat well. Diet is still far more important than exercise, despite what your personal trainer will tell you. My personal trainer has admitted to me on several occasions 'I would never exercise to cut body fat, I would just eat better, but I can't tell my clients that.' The fitness industry have a VESTED INTEREST in telling you to come to the gym (buy memberships etc).
Till next time, Jack.