So let’s check worldwide sugar consumptions:
Genetics will determine how effective you can transform food into building materials for your body. People who originate from areas where starvation was quite common (Africa, Europe) tend to get more calories from their food. So if they get enough food, their bodies will start to build fat reserves. Europe has sugar-rich diets so they develop more fat, which includes fat tissue in the breasts. Starvation is still a problem in Africa, though. Then again, their diets generally have a lot less sugars.
Also important are the bacteria in your intestines. All humans have then and they’re passed on from mother to child. And sometimes from other sources. Those bacteria in your intestines will help to transform into valuable resources for the body, as long as you have the right ones. These bacteria are part of the environment that has a big influence.
Certain body types keep appearing in various families but you have to remember that certain feeding habits are also common in certain families. Changes in diet can have unexpected effects. For example, people who start a vegan diet generally lose weight as the amount of fat tissue is reduced. And the people in the Netherlands were reasonably short to average length before WWII. But after WWII they started eating more sugars in their diets (and more junk food) and the Dutch are about one of the tallest people these days. Genetics? Or diet?