Hair loss on fast800??

[Nonononon]

Ok I'm maybe being paranoid.
I've started the fast800 diet, 1 week down, feeling really good and plan on sticking to it for 12 weeks as I have at least 2-3 stone to lose.
I'm worried about hair loss with this, mostly because I had a friend who lost LOTS of hair from dieting but she was following 1200 cals for about a year. I dont think she was getting enough protein and her diet was carb heavy with little fruit and veg, which might have been the problem.

Can someone reassure me that this wont happen on this diet if I'm following it correctly?

All I eat is fresh veg, meat, fish, eggs, ff greek yogurt, some cheese, berries and olives. Sounds ok but its also only 800cals.
I want to stick to this as I feel great and really want this weight off.

Will my hair survive??

Take a good biotin supplement.

If you stay on it for a while you may lose some hair. I did after being on it for about 12 weeks, which was scary. But it does come back - and yes, people say biotin helps. I only started taking that a couple of months after the 12 weeks, and my hair has certainly grown back, but don't know if it was the time or the biotin or a bit of both. Now, I would take biotin at the same time as dieting.
Hope you get on OK