It's frustrating for sure. And it's not as simple as everyone makes it to be.
The calorie in / calorie out has a lot of variables that need adjustment. It's very important not to go on an aggressive diet but requires working down from what you consume right now where the weight is stable (maintenance calories). Unfortunately, what most people don't talk about is the effect of LBM loss and its effect on the RMR/BMR [1]. Your energy expenditure decreases further as you lose the LBM. It will be further worsened if you went for a very aggressive weight loss strategy with very low calories as your body will adjust to that and your hormones might be temporarily imbalanced [2].
Weight lifting and a full strategy for fat loss is essential for long-term success.
I personally do believe metabolic damage (or the better term metabolic slowdown) does happen, but it can be fixed by gradually going back to the correct maintenance calories with a solid weight lifting program (3x per week works) to back it up for a few months. This will result in some gains in the short-term (hopefully more of it being LBM). And you can go back to the fat loss phase again from there.
To add to it, the course the calorie in / calorie out model isn't as simple since macros still need some thought. You definitely need about 0.6-0.8g of protein / lb of bodyweight to gain muscle or about 0.8-0.9g / lb to maintain it at times of calorie deficit. [3]
The calorie in / calorie out has a lot of variables that need adjustment. It's very important not to go on an aggressive diet but requires working down from what you consume right now where the weight is stable (maintenance calories). Unfortunately, what most people don't talk about is the effect of LBM loss and its effect on the RMR/BMR [1]. Your energy expenditure decreases further as you lose the LBM. It will be further worsened if you went for a very aggressive weight loss strategy with very low calories as your body will adjust to that and your hormones might be temporarily imbalanced [2].
Weight lifting and a full strategy for fat loss is essential for long-term success.
I personally do believe metabolic damage (or the better term metabolic slowdown) does happen, but it can be fixed by gradually going back to the correct maintenance calories with a solid weight lifting program (3x per week works) to back it up for a few months. This will result in some gains in the short-term (hopefully more of it being LBM). And you can go back to the fat loss phase again from there.
To add to it, the course the calorie in / calorie out model isn't as simple since macros still need some thought. You definitely need about 0.6-0.8g of protein / lb of bodyweight to gain muscle or about 0.8-0.9g / lb to maintain it at times of calorie deficit. [3]
[1]: http://www.bodyrecomposition.com/fat-loss/lean-body-mass-mai... [2]: http://www.ncbi.nlm.nih.gov/pubmed/12609816/ [3]: http://www.ncbi.nlm.nih.gov/pubmed/22150425