2 Weeks of 4:3 and I've put weight on! What am I doing wrong?

[NewNameforNewTerm]

I've been 4:3-ing for two weeks now, so 6 fast days. On the non-fast days I'm sticking to around 1,200 cals. On fast days I'm at 500. I weighed myself the day after my first fast and had lost a pound. Then I decided not to weigh myself until I had completed the next week, i.e. today. I am devastated to find I've gained 2lb! I've kept a food diary and double checked my calorie intake for the weeks to check I'm not overeating on non-fast days, I've drunk lots of water, I've kept my exercise level constant, post-menopause so no hormonal fluctuations. What am I doing wrong?

[Whitershadeofpale]

I'm no expert but I think not enough on non-fat days. Work out what you should eat to maintain and then eat that on non-fast days.

[MarieB1974]

On the plan I follow which is similar people sometimes lose inches round their middle on the first few weeks but no pounds. Stick with it, scales will start to move soon...

[Mintyy]

1200 calories on nfd seems very low. Where did you get that figure from?

[goforthejobular]

So you're dieting on 4 days, fasting on the others? Eat more and have some good fats.