What do you mean by followed the rules?
We need more information in order to help 🙂

Still not enough information. Are you counting calories on non FDs in order to ensure you aren’t eating more than your TDEE?
What are you eating, are you trying to make healthy choices or do you eat a high proportion of carbs/sugary food?

Drinking lots of water isn’t a rule. It is suggested that we drink more on FDs as we get a lot of the water we need from our food.

This might help

https://thefastdiet.co.uk/forums/topic/the-basics-for-newbies-your-questions-answered/

1. You could be overestimating your TDEE. It is common to think our exercise category is the one higher than it actually is. Try using the next one lower down.

2. You don’t have to eat righ up to your TDEE if your hunger is less than that on nonFDs.

3. Are you guesstimating calories or actually weighing and measuring, writing down and adding up? It’s tedious but worth doing for a week or 2 to really understand how much it is on the plate.

4. Are you drinking calories you’re not counting e.g. Milk in hot drinks.

5. Try writing down a food diary. It will show up patterns

6. I fell into the group of people who’s body will not lose weight if I eat starchy carbs i.e. Grains, potatoes, pumpkin, peas, corn. For me I had to add lentils, chickpeas, dried beans. Don’t know why this happens but there seem to be a group of people who cannot lose the weight without giving up grains and sugar. Try limiting these 2 right down or cutting out for a week or 2 to experiment.

Just don’t give up. Keep tweaking what you’re doing till you find what works.

If you were eating more than your TDEE then it is a problem, otherwise it isn’t.
There are many diets but there is only one way to lose weight and that is to eat less calories than your body needs, so if you want to eat less on non fast days that’s fine.

Now that you know you aren’t doing anything wrong you can relax and keep going as the weight will come off. It isn’t a case of losing the same amount every week but the overall trend should be down if you can stick with it.

Sound advice from Merryme!

Good luck 🙂

You’re only in week two… I’d give it another couple of weeks at least before you take any serious notice of what the scales are telling you… even then, you might notice other differences that mean something too.

It also makes a difference knowing how much weight you have to lose… if you’re close to your goal weight and ‘only’ need to shift those last 10 lbs, then you’re going to have to expect some subtle shifts up every now and then.

…it also depends on how hydrated you are when you weigh yourself – make sure you weigh yourself at the same time each day (when you first get out of bed is when you’ll be at your lightest usually)… your weight will probably fluctuate by something like 3-5 lbs during any given day, especially if you are drinking lots of water.

(but give it a couple more weeks at least before you start hitting the panic button)