do the atkins diet with full discipline and you'll drop 15 pounds in the opening 21 days of eating less than 20g of carbs. after that you're allowed 40g and can eat things like fruits and dairy. after 3 week of that all have a grasp on what eating healthy actually means will never go back to things like fruit punch or pop tarts and stuff of that nature. its amazing they are basically selling poison to you.
at that level, the body needs to adapt. It shall run on ketones (the breakdown of fats). It has no choice. Nutritional ketosis-a ketogenic diet
1 gram of carb= 4 cal
20 gram * 4= 120 cal a day from carbs allowed. That's it.
at a 2500 cal daily intake that's basically 5% carbs. MASSIVE change here. Therefore the macro allocation would be something like; 65 % healthy fats 30 % protein 5 % carbs. Classically a ketogenic diet is about 10% daily calories from carbs
one can confirm they are in ketosis via ketostix. They are very cheap. There is an adjustment period as the body initially freaks out -- 'keto-flu' . Mental fog, diarrhea, cramps, nausea...However, it shall adapt. The breakdown of fats for energy is a NORMAL process. You're just forcing the body to run on it (ketones), as it no longer has a sufficient intake of carbs.
there is no more dispute as to the weight loss benefits of such an allocation of macros. In addition cardiovascular and cholesterol profile improve . Also decreases systemic inflammation (c-reactive protein). Don't be surprised if you find IMPROVED mental acuity.
http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0056190/
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2716748/
http://ajcn.nutrition.org/content/85/1/238.full
clearly the above three links aren't from 'kook sites'.
on a ketogenic diet, electrolytes can go out of whack (sodium, mg, potassium). May need supplementation. Atkins diet must provide this in the food choices or as supplemts, dunno.
some people are genetically very 'carb sensitive'. For those, ketogenic diet may be for life.
Anecdotally, a very good friend lost 80 lbs on a ketogenic diet. Physically remarkable transformation. She said the initial start is very hard-but, after awhile, her hunger pangs disappeared. No cravings for sugar . I like to do ketogenic cycles. 3 mths or so. I find i 'feel' better while in ketosis. Less mental fog.