My nanna was told to lose weight because of a heart valve issue in the 1970s. Guess what she was told to cut out - that's right, CARBS. Not fat.
Any health risk from low carbing really comes from no-carbing, where you eat no veg or fruit at all; because it creates an imbalance in electrolytes in the body - and may cause problems with calcium being pulled out of bones to address this, and because you may miss out on some vitamins and minerals.
The current food pyramid model is so far wrong it's not funny. I don't honestly know WHAT they were thinking when they produced that, unless it was from an economic point of view, when grains were a lot cheaper than other food types.
YEARS ago I saw a documentary on the tv about heart disease. Apparently in 1972 or thereabouts, there was a Report done on reasons for the increase and four food substances were accused - salt, sugar, cholesterol and saturated fat. But according to this documentary, Mr Tate of Tate & Lyle, who was a big political subscriber too, managed successfully to get the sugar part suppressed!!
Of course, since then it has been shown that increased cholesterol intake does NOT directly or necessarily lead to increased blood cholesterol, as the body makes and recycles about 80% of its own cholesterol.
There is some evidence that increased saturated fat --> increased blood cholesterol, but that was before people started differentiating it into LDL and HDL - if it's HDL that increases, then that's a GOOD thing (although LDL should not be demonised - it's essential for carrying out body repairs. We'd all fall apart without cholesterol, it's the glue that binds every cell together).
Do you know that sugar is completely unnecessary as a food stuff? Some carbohydrate is useful, in that it's the easiest way to get the glucose the brain likes to function on, but it's better taken from complex carbohydrates, which also have the added benefit of feeding the gut bacteria and keeping them healthy too.
But the point about this WOE is to start off by killing the sugar craving - not to remove carbs completely - so any discussion of no-carb diets won't be relevant. :)