Yes, it's slim, but so what? Nothing wrong with being slim. I am 5'7, I looked really good when I was 8.6 stones and I was as healthy as anything.
The ridiculous competition to over-eat and being overweight on this forum is tiring.
I am heavier now, I am much more toned and have built on muscles, and had kids and all that.
Again, nothing wrong with someone being very slim, it has never been the sign of being unhealthy.