Your longest nerves are the first to fail and, it looks like, the last to come back. A University of Michigan group followed 79 people for two years after weight-loss surgery. On average they lost about 68 pounds. They took tiny skin biopsies and counted the nerve endings. In the thigh, the count went up. Down in the lower leg it didn't really move. That fits how these nerves are built. The one that ends in your foot starts near your spine, so it's roughly three feet long, and the cell has to keep all of it supplied. When metabolism goes bad, the far end runs short first. When things improve, it's the last place the repair gets to. I watched a version of this for twenty years after nerve repairs. Feeling came back in the palm well before the fingertips, and the last stretch was always the slowest part. So if you've lost weight and your feet still tingle, I wouldn't read that as nothing working. It may just be early. It's one study, and there was no comparison group. If a randomized trial showed the lower legs recovering on the same timeline as the thighs, I'd drop the "last to come back" part.