Losing small amounts of weight can have significant impacts on your life:

A new study shows that for each pound of body weight lost, there is a 4-pound reduction in knee joint stress among overweight and obese people with osteoarthritis of the knee.

Researchers say the results indicate that even modest weight loss may significantly lighten the load on your joints.

I think it is something that many people miss, that each large change consists of many small changes that add up over time.