Your metabolism is simply the ENERGY your body burns to operate.
A higher metabolism means you are burning more calories...lower metabolism burns less.
Your body size, weight and overall composition all are factors in how your metabolism manages your body.
Someone with a lot of muscle will burn more energy...it is why building muscle is so important.
You might have a slim bodied person who "looks great" but they have little muscle fiber built up. Their metabolism is going to be lower.
You can increase and improve your metabolism by stabilizing your intake (no more than 3 hours between) and exercising! It is very simple, not rocket science. This applies to a normal body, without medical issues.
The word DIET should be right there with the other "4 letter words" we shouldn't use. It's been messed up to be a way of NOT EATING rather than EATING HEALTHY.
Eating every 3 hours (all valuable and nutritious filling foods) is like stoking the fire in your wood burning stove. Keep adding logs (and if you get an oak piece it burns even longer...right??) throughout your day and the fire will burn long and stay HOT. Same goes for your body. That "oak piece" would be like eating something that is low on the glycemic index (GI) and a bonus would be that it is ORGANIC so you aren't infecting you body with toxic waste!To see some good examples of foods with LOW GI click here. I (we) do NOT want you to eat artificial anything whenever possible.
But back to METABOLISM. Now what does exercise have to do with it? You need to MOVE YOUR BODY ACROSS THIS PLANET regularly. We want you to also use the Perceived Rate of Exertion to keep your workout aerobic level between 7 and 9 for 20 minutes at least. That's basically unable to speak more than a word to almost feeling fully POOPED OUT.
When we are working with weights you need to have enough to BUILD MUSCLE. If you are flinging the weights like toothpicks, it's time to get heavier weights. If you have options ALWAYS BRING ALL OF THEM TO CAMP.
The above is the secret that everyone knows! You just need to make it part of your lifestyle and hopefully those around you will clue in too.