From activity levels and diets, there are various factors that contribute to your weight gain/loss.  Here are 8 of them:

  1. Muscle – Here’s a riddle for you: which weighs more, a ton of feathers or a ton of bricks.  Answer?  They BOTH weigh a ton.  So, when you hear someone telling you muscle weighs more than fat, some people may interpret this differently and take this to be false statement if they translate it to a pound of muscle to a pound of fat.  However, if you were to look at a pound of muscle and a pound of fat side by side, the fat takes up more volume.  Why?  Muscle is denser than fat.  So to clarify, what is really meant is that muscle weighs more than the same volume of fat.  A pound of muscle needs about 50 to 150 calories a day to sustain itself so even at rest, muscle will help you burn calories.
  2. Bone Density – Bone density is the amount of minerals contained in a volume of bone.  Everyone’s frame size is different but a larger framed size person can attribute a small portion of their weight to their bone density.
  3. Gender – So, what’s the relationship between gender and weight?  Men generally have more muscle, less fat, and heavier bones than women.  With more muscle mass, men tend to burn calories at a higher rate when at rest.
  4. Activities – Are you active?  The more physically active you are, the more you benefits you get.  Increasing your activity increases muscle strength, and metabolism, all which help with weight control.
  5. Life Events – Pregnancy, stress, smoking (quitting), relationships, family, and a whole other list of life events can affect your weight.  Depending on the event itself, people will either eat more or simply lose their appetite.
  6. Environment – Your environment can easily be a factor affecting your weight.  For example, if you have to get to the second or third floor of a building, you’ll have the option to take the stairs, elevator, or even an escalator if one is available.
  7. Stress – Stress can be affect you in a lot of ways including your body, behavior, and mood.  Your behavior may directly affect your eating habit which may cause you to eat more or not at all.  That’s why many people experience either weight loss or weight gain during stressful periods in their life.
  8. Food Portions – Whether you have will power or not, portion size appears to contribute to some people’s weight.  Some research has shown people to eat 30% more when served with larger portions.

Of course there are other contributing factors that indirectly affect your weight but these are the eight factors that affect it the most.