I am seeing more and more T1's using a LC diet, and eating less than 100 carbs per day. I needed to lose weight in the very early part of this century and gradually lowered my carb intake from the high 100s to 100 per day. I did not have the energy to do my exercises and home repairs. Taking a one hour walk was a chore. I raised my carb intake to 130 per day and rested while exercising. I adjusted well and lost weight too. I think some of us will have more difficulty with a LC diet. My age may have a lot to do with that (72). I do eat some protein and fat, but not very large amounts.
I started taking Metformin early last year, for my insulin resistance (IR). Now I weigh 17 pounds less than before starting Met. I was not trying to lose weight, so it must be the Met that caused it. My weight is now only 6 pounds above my ideal weight. That is great, but I was losing 1-2 pounds per week for awhile. I thought I might eventually drop below my ideal weight. So I raised my carb intake to 150-160 per day. My weight stabilized, and I was no longer losing weight. I was not gaining either. Very little fluctuation. That many carbs would have caused a lot of weight gain before Met. My IR and the Met seems to be very important factors in the mix.
Now I can take long walks, climb ladders and paint my house, and work out at the gym without any problem. My stamina has greatly increased. The gym workouts and higher carb intake seem to be responsible for that. LC dieting does not work for me at this stage of my life. We are all different!
I've cut back to about 80-100g/day and all the protein, meat, fat, veggies, and fruit I want... just no/little processed grains, pasta, bread, etc. I've lost 20lbs in 6 weeks and my cholesterol has dropped from 200 to 155. I don't have a problem with decreased energy.. but I'm also in my late 20s.
I know this type of plan doesn't work for everyone, but I'm loving it! If you're curious, give it a try. Google 'Paleo Diet'.
Thanks for your experiences. One question that always concerns me is that while people drop their carbs, it is also important to get sufficient nutrients, particularly protein and fat. I actually increased my protein when going low carb, routinely getting 150 g/day. Bernstein actually recommends that you change your levels of protein to address weight issues. When you went to lower levels of carbs, did you make an effort to monitor your protein and fat levels?