I had it for a few months wen I was still losing weight. Then it just stopped.

It happened to me as well about 4-6 months in. There's a couple of things going on from what I learned back then. First your hair grows in cycles, so there are time periods where you are growing lots of new hair and times where you are growing none, this is true for everyone whether you are losing weight or not, your hair will also always be falling out each day. so if you are in a time period where you are not growing new hairs and its falling out it will be thinner. Second when you are eating at a caloric deficit your body will use the fuel you provide for essential functions, running your organs, heating your body, etc. the non essential ones will not receive as much fuel, hair growth is a non essential function so its very common for weight loss and caloric restriction to trigger a dormant period. The good news is it'll start growing again and fill back in. Make sure you are getting enough protein in your diet as well, too low on protein can also cause issue. The only part that really sucked was when it started growing again I had all these tiny short hairs sticking up out of my head especially along the hair line that were too short to lay flat lol. You can also try increasing your calories a bit, the larger the deficit the less to go around for all the things your body needs to do.

Last time I lost a significant amount of weight (about 80 lbs, not low carb), I lost a lot of hair as well. I think it's pretty normal with weight loss. Doctor told me to take biotin.

One other thing to consider is that limiting protein intake may also be a factor as hair and nails are made of keratin which is made up of protein so when you limit protein, often times nails become weaker and thinner and hair sometimes becomes thinner and you may notice you're losing more in response to this limitation. Try increasing your protein for a while and see if that helps.

I've just started having a lot of hair come out in my brush. I'm 5 mo into Keto and lost most of my 18 lbs the first 2 mo. Then I was on a plateau for a few mo. I was eating too many calories. I made Keto goodies but ate dessert when I wasn't really hungry. Now I'm trying to eat only when I'm hungry, and started losing again. But the hair just started really coming out recently. My nails are good. I hope it is just temp like many of you are saying. Hey! We could start a new fad with our short hairs growing back in!

Not to say its not worth it, but I spent a fortune on quality vitamins to replace all the things I may have been lacking and I really dont feel that it helped my hair loss any. The loss didnt slow until i started eating more, which slowed my weight loss to a crawl. I take biotin and collagen and everything else under the sun and have been since about a month after I started my weight loss journey. I still take them all, just in case, but I'm not really sold on the value. But YMMV, everyone's body is unique.