Is it just me but in most cases when you see a heavy and skinny girl together the heavy girl will in most instances be taller making the skinny one look tiny beside her.
Most Helpful Guy
Heavy girls ate a lot so had all the nutrition and mass put into their body to grow the best. Previous generations being malnourished is speculated to be why modern people are taller. Maybe a similar principle applies to fat girls. Also there's what anon said about estrogen and testosterone levels.0