Lavender - I suggest you do a bit more reading about this WOE. Only then will you be able to reassure yourself. I really recommend that you read "The Diet Delusion", by Gary Taubes. It is a weighty tome, but massively thorough.
What I really, really don't get is why someone would even contemplate that a diet based on fresh meat/fish, vegetables and salad, with natural fats like butter and olive oil might be harmful?
Given that we know that there is no link between eating fat and getting fat, or between saturated fat and heart disease, then what's the issue?
Whereas we do know that there is a link between high carbohydrate consumption and:
weight gain
obesity
diabetes
cancer
Alzheimer's
Need I go on?