Why has my eye colour changed? also appearance!?

When I was a young child I had the bluest eyes ever but when I reached about 11, my eyes started becoming green and were like a blueish-greyish green up until I think it was 13 or 14 where they were a definite green, but quite light. I started a new school at 14 and within the second year started lots of fasting and yo-yo dieting, this resulted in a lot of change in my body as I transformed into being quite thin as did my face shape and my facial features became small as my hair also went from dark blonde to light brown. It was originally blonde before that. The dramatic change happened when I didn't wear as much makeup at 15 after previously wearing TONS (my skin didn't break out as much) and also was an Ariana Grande fan, which I still am. I looked weak, ill and pale until this year actually, I decided it wasn't doing good for me and was feeling not great. I am now 16 years old and decided after having a mostly chicken diet, I would try eating red meat instead. So I did, and gained a fair deal of weight and felt better physically. I dated a douche, got dumped and then after this ironically became a Belieber as I realised yeah I like Justin Bieber ok then? At this stage everything started looking like his, my eye colour changed to like a hazel green-brown (im not sure which), my eyes got back to their natural bigness, my lips became fuller as instead of avoiding lipbalm, I put it on loads. And the natural olive skin I had that appeared more obvious.