A recent finding of research into nutrition for zoo animals revealed that giving bears larger enclosures with added distractions (activities) helped to reduce the focus on food so that the bears were healthier and fitter.
This is also an excellent tip for pet owners with a dog that seems to be constantly hungry. Environmental enrichment, including plenty of exercise and social interaction, is a great cure for boredom and stress-related behaviour problems. It also helps in weight management, which appears to be an increasingly common problem in pet dogs.