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Ask An Expert

Exercise or Weight Loss for Health

Junaid H. Khan

Junaid H. Khan, M.D., FACC, FACS

SEBMF HMO Network

Alta Bates Summit Medical Center - Alta Bates Campus

Sutter Santa Rosa Regional Hospital

Alta Bates Summit Medical Center - Summit Campus

Eden Medical Center

Question:

My goal next year is to improve my overall health. Can you tell me if I should focus more on lowering my weight (as I'm a few pounds heavier than I should be), or concentrate more on exercising?

Answer:

That is an excellent question. A study in the AHA journal Circulation addressed this question. The title says it all: "Physical Fitness Trumps Body Weight in Reducing Death Risks".

The study looked at 14,345 adult men and found:
  • Maintaining or improving fitness was associated with a lower death risk, even after controlling for Body Mass Index (BMI) change.
  • Every unit of increased fitness (measured as MET, metabolic equivalent of task) over six years was associated with a 19 percent lower risk of heart disease and stroke-related deaths and a 15 percent lower risk of death from any cause.
  • Becoming less fit was linked to higher death risk, regardless of BMI changes.
  • BMI change was not associated with death risks.
One key caveat is this study did not include morbidly obese (BMI>30).

This is good news for people who have trouble losing weight but are still physically active. For example, in a very simplistic way comparing two equally moderately overweight people, the person who maintained their level of fitness would have a lower chance of a cardiac event than the one who lost weight but was inactive. Physical activity is defined as 30 minutes of vigorous exercise daily.

Of course, accomplishing both goals is the ideal: Maintaining a healthy BMI and staying physically fit through exercise.

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