'No diet which seriously restricts any of the major food groups can be considered healthy in my opinion, they just mess up the bodys natural metabolism'
I used to think that. But then I learnt that we've only been eating high carb diets for the last 10,000 years. For many, many thousands of years before that we didn't have much in the way of grains, just the occasional amount of wild grains here and there and some starchy tubers and fruit. Grains/carbs aren't a major food group for humans from an evolutionary perspective. We got by for a very long time on mainly meat, fish, nuts, veg and fruit. Thrived in fact. And there's (supposedly, I'm not sure how proven this is) evidence that when people did start farming grains about 10,000 years ago, our health as a population declined quite drastically.
I used to be so anti-low carb diets. They seemed like a fad. I knew people who had put on a ton of weight having done Atkins, but then Atkins is a bit extreme for my liking. I do Paleo now, so I can eat sweet potatoes, carrots, a bit of fruit and other carbs, but it is still low carb as it's hard to eat too much of them. I read the science behind it all and I'm a convert. I've lost 6 pounds easily in the last month (No more hunger! More consistent energy and enjoying my food so much more too after years of a low fat diet) and given that I can't exercise that's pretty great.
The information out there is so confusing, it makes me cross. There is heaps of scientific evidence that high carb diets are really bad for you. Saturated fat is good for you. Not bad. It's bad when we have a lot of it in our bodies. But it's good to actually eat. Far better than eating high carbs which messes up insulin levels. Sat fat has lots of vitamins, it gives you energy, it is satiating - it's hard to eat a lot of it. see here
I am astonished at myself writing these things, it's been a 180 switch for me. But since I started reading into it I can't believe how many anecdotes there are online of people controlling IBS, Type II diabetes, asthma, inflammatory conditions like arthritis and other things with this way of eating. It's amazing.