One question I see a lot is "What percentage of carbs, protein and fat should I be eating?" It gets confusing because companies always seem to be pushing low carb, low fat or high protein eating.

It's important to know how much carb, protein and fat you're eating because they play different roles in your body. You want to give your body the right kind of energy -- and everybody has different energy needs. Don't eat 'low this' or 'high that' just because everybody else is doing it.

Let me quickly take you through why your body needs carbs, protein and fat, where you get them and what percentages are recommended.

Knowing your numbers when it comes to nutrition can go a long way to helping you lose weight and get fit. Whether it's calorie counting or making sure you get enough vitamins and minerals, food is fuel for you body. So, why not make sure you body is getting the right amount -- and the best kind -- of fuel.

I've put together the nutrition tools and calculators you can find at FitWatch: