I am very near my goal weight and am currently upping carbs by 5g a wk until I stop loosing/gaining.
I have never really established how much fat to add after phase 4... And what is the purpose of that fat.. Is it to remain in Ketosis for life? Or to fill you up?

I suffer from chronic constipation and find sweet potato the best form of fibre For Me (I've tried EVERYTHING)
So I would like to start to add a bit of sweet potato to my evening meal. In the past (after weight loss, I would either eat Fat Free with carbs or High Fat low carb.. It is a new concept for me to add butter to a piece of sweet potato, I'm just trying to establish what would be the best approach FOR LIFE..After the diet.. And to fully understand the Reasoning for adding fat..
I do tend to get hungry suddenly every four hours and can sometimes over eat protein in the form of multiple cans of tuna. I'd like to up my veggies and generally learn how to feel full after a meal.