Yes, there is a connection between body type and weight gain but only as much as where the weight is stored.
Your body structure or 'frame' usually determines where you will initially carry any excess weight.
Unless you're incredibly lucky, or a martyr to the gym, most of us will gain a little weight through the trials and tribulations of life - usually around middle age if not before - and it's likely to be the middle area of your body that takes the hit.
Whether it's child-bearing, over-eating, the menopause, the inevitability of ageing or other problems - a thickening or accumulation of fat somewhere around the middle part of the torso is likely to happen.
Your Body Type decides...
It is your generic Body Type which dictates where you carry any excess weight - it's not something that you've done!
Your bone structure, that is the relationship between your shoulders and hips, determines your shape and how the weight is distributed and supported by your frame.
Identify your Hip Shape, then it's easy to find your own Body Type. It won't help you to lose weight but at least you will understand how and why your fat has settled where it has.
If you have a Rectangular Body Shape your shoulders and hips are usually well balanced.
You have a High Hip or Straight Hip line and you always retain slim and shapely hips and thighs.
When we look at your body type and weight gain, you will be aware of excess fat gathering above your waist creating a Midriff Bulge. However, you can carry it quite well without it showing and affecting the way you look.
Your Positive Points
When you gain a small amount of weight, it is quite easy to disguise as you always retain slim and shapely hips.