I am not overweight by any means, 5'8'' tall and weigh at around 150lbs. my concern is more torward athletic perfomance, as i was told to stay away from soda if possible when i used to work out hardcore back in high school. to my understanding its the caffein and carbonized stuff you want to stay away from, not so much of sugar in it from that standpoint. being no biology or HPS major, i am no expert in this and have no explannation why things work like that... but i noticed one thing tho, i did feel much lighter and energized when i was successful at resisting the urge to drink soda. placebo effects, maybe?