You can eat as many potatoes as you like until you feel full.
I know what you're thinking... hmm refined carbs for weight loss and health???
Well here's the good news, resistant starch found in potatoes is not digested, instead your gut bacteria processes it.
The only downside is that you can't add anything such a butter, cream or milk to your potatoes. If you really want to benefit from this, it is an extremely strict and bland process. However, you can add hot sauce as it doesn't contain calories or sugars and I've been adding chives and paprika to my potatoes.
At the start of the week, you should cook a batch of potatoes so they are ready for the week. The potatoes must be cooled down before you can eat them, that's where the magic happens and resistant starch is made.