I'm not sure how popular this idea is in this community, but I've heard some say the reason for such high obesity is because of F-ed up hormones caused by continual high blood sugar levels affecting insulin and other important hormones.
F 5 ft 3. HW: 196 lbs. Primal SW (May 2011): 182 lbs (42% BF)... W June '12: 160 lbs (29% BF) (UK size 12, US size 8). GW: ~24% BF - have ditched the scales til I fit into a pair of UK size 10 bootcut jeans. Currently aligning towards 'The Perfect Health Diet' having swapped some fat for potatoes.
According to GAPS diet, even rice would feed bad gut bacteria though, have i got this theory correct?
Not "hormones" in the traditional sense that people think of, but hormones and important signallers non-the-less
As long as your workouts are kept under 45 minutes I don't think you need that many carbs. I have one sweet potato a week and a little bit of fruit here and there, and I swim and kayak 5 days a week and lift weights hard 2 days a week and sprint 3 times a week just fine.
It's totally relative. Just figure out what works for you; it will take time and experimentation, but no one on this forum can tell you what will work best for you. I am a 24 year old female; I do crossfit 3-4 times a week and yoga 4 or 5 times a week and I eat sweet potatoes almost every day, and I am lean and healthy. Even if you were the same age as I am and had the same level of activity, your needs would likely be different from mine.