Not looked into this particularly just yet (I’m just completing Day 5) and I’m quite geek about this sort of thing, so will be giving it some thought.
For now I’m probably around 60% protein, with a little fat within that (such as bacon and egg yolk, pilchards), the rest being either non-starchy veg, a piece of fruit and some beans or peas.
To be honest, I’m just trying to get the best bang for my buck calorie-wise, as we have so few to play with. I’m all in favour of fat consumption in principle, but it’s so calorie dense that I avoid it unless it’s part of something else. Then, by the time you reject the starchy carbs – which is the basis of the BSD – that leaves protein, pulses veg and fruit.
It’s all a bit had hoc at the moment, but so far so good.