• Entry
  • Reader's guide
  • Entries A-Z
  • Subject index

Much research effort and expense is expended trying to find the causes of obesity, both genetic and environmental. Researchers have used one of nature's own experiments, the phenomenon of twin births, ...

    • Loading...
    locked icon

    Sign in to access this content

    Get a 30 day FREE TRIAL

    • Watch videos from a variety of sources bringing classroom topics to life
    • Read modern, diverse business cases
    • Explore hundreds of books and reference titles