The medical profession gets fixated on things.
At the moment it's FATS
If you cut fats, which they advise, you need something to take their place. So since Proteins are supposed to injure your kidneys :twisted: (Which is rubbish) the only alternative is carbs. Now even the medics know that sugar leads tto Blood glucose, they advise "Complex" carbs, Ie Starch, which weight for weight turns into double the amount of BG that Table sugar does.
the ideas that don't cross a medical mind very often are: "don't replace sugars and fats. Eat less"
Or "cut the food group that you can't process"
Then there are Food pyramids and the Healthy Eating Plate.
All based on no scientific research and desined to become "Facts"
then they found out that low fat is bad for inants and that some fats are essential to adults too.