Portion control is challenging for me too. I did find that the novelty of the feed days started to wear off, so after a while I wasn't stuffing myself as much on those days as when I started 5:2. I try to be semi responsible but there are some foods, like take out Chinese, that I will always overeat. This past Sunday I went to a very nice all you can eat brunch and I only got one plate of food and a small amount of soup I wanted to try, which is not my usual approach. These days I'm trying to watch what I do a bit on the feed days because I'm trying to get to a specific goal; however, I am not counting calories or depriving myself. On the feed days I also try to work out more and, sort of by habit, skip certain meals when I'm not feeling too hungry (my "hungry" gauge is totally re-set thanks to 5:2). So, if I am doing something special that day, such as lunch or dinner out, I don't worry about the extra calories. Like others have said, I fill up much faster and I do far less all day grazing than I used to as a result of fasting. hope this helps.
