Diet?

I am certainly no expert and I am sure someone with a far better insight in to this will be along soon but I would say don't panic too much, sometimes a sudden change in diet can have a negative effect coupled with exercise (which always adds a bit of weight for me in the first couple of weeks) could have resulted in this gain. Just re-asses what you are eating, make sure it is balanced and healthy. :thumbup:

you have cut our fats and carbs? completely?

you may be putting your body into starvation mode, which is counter-productive and results in a fast regain of weight and slow weightloss as your body fights it.

Is there a medical reason for cutting both these food groups out?

I dont know how tall or old you are, but going under 1200 cals for a woman may well put you into starvation mode.

Also, muscle weighs more than fat, so the extra exercise may be putting muscle on.

It depends on what you have been eating usually. The media always say how good fruit is for example but eating a lot of fruit can lead to weight gain as it has a lot of sugar. Are you able to give us some insights into your diet?

Also, if you are exercising, you may be adding muscle weight. It is sometimes the case. Again, any insight?