A useful video: http://livinlavidalowcarb.com/blog/video-my-safe-starches-panel-at-ahs12/16567
My take on this is sugar is evil, fructose, glucose and lactate. We need none of these.
Wheat (and barley, rye) has three strike against, gluten, high caloric density/low bio-available nutritional density as modern processed and modern cultivars, and it is in appetite driving exorphins.
Protein in excess is damaging, better to be under than over.
Set carbohydrates as starches with high fibre, greens, perhaps a few stems and roots. 30 to 70 grams per day, enough to avoid sever dry throat. Set protein at low but adequate level. Vary weight by controlling the fat.
Avoid hormone rich meats, factor pork and chicken. Avoid exorphins, endocannabinoid, omega 6 rich foods, processed foods.