As far as the "SAD high carb diet", it isn't particularly high carb/low fat. 50%c 15%p 35%f isn't particularly high carb or low fat. I would consider high carb to be like the fruitarians or Mcdougall followers who eat around 75c- 10p- 15f or 80-10-10. As far as the "old normal" before the government advice it was said to be 45% carbs, which is hardly much of a difference to todays 50% carb level. The "healthy SAD diet" which the government recommends isn't high in sugar at all. In fact sugar is up with oils in the "use sparingly" category.