A can of coke contains about 155 calories. An average person can do practically anything which is reasonably considered exercise for 30 minutes and burn that off: <a href="http:&#x2F;&#x2F;www.health.harvard.edu&#x2F;diet-and-weight-loss&#x2F;calories-burned-in-30-minutes-of-leisure-and-routine-activities" rel="nofollow">http:&#x2F;&#x2F;www.health.harvard.edu&#x2F;diet-and-weight-loss&#x2F;calories-...</a><p>Hardly &quot;incredible&quot;.<p>Research has shown that diet is more critical than activity in the occurrence of obesity, but that doesn&#x27;t been that activity doesn&#x27;t matter at all.