On a recent podcast, I pointed out some of the dietary guidelines we've had been given in the last few decades was full of crap, more specifically the ones that said we should eat a low-fat diet. It generated some discussion on my Facebook timeline.
At various points in my life, I have tried to eat differently in order to lose weight. The only thing I did that approached success was Atkins, but I could not sustain it long term. Many other things I tried either didn't work at all or did only for a very short period of time and probably weren't healthy for me in hindsight.
Now that I know I am diabetic, it turns out a diet lower in carbs is what I need to not risk complications from uncontrolled diabetes. I know that being as hardcore about carbs as when I was on Atkins is simply not realistic, but I can see very clearly in my blood sugar numbers when I have too many of the wrong carbs on any given day.
Lowering my carbs, along with keeping an eye on my caloric intake and being more active has improved my weight situation. So far I'm down about 30 pounds since October, which is nothing to sneeze at, but I could lose a whole lot more.
In general, I would be wary of any dietary advice with the possible exception of the dietary advice provided by Brazil's Ministry of Health. Ultimately, you have to figure out what works for you.