Very angry response from someone with a completely healthy attitude towards food there Anyone. One slice of pizza is not a meal or worth getting your knickers in a twist about.
An adult female needs roughly 1800 calories a day, depending on build, activity levels, age etc. One slice of pizza is (and I know this because I just looked at the large Pizza Express pizza in my fridge), 112 calories if cut into eight slices or 140 if cut into six. Neither of which constitutes a meal for an adult woman unless she's about 3 feet tall and indolent.
Your use of the word pigging is also very telling.
My relationship with food is entirely healthy, I love cooking and eating, it's one of the most important things in my life, good food and sharing it with others is a huge pleasure, I feel no guilt or strange emotions towards food and I stop eating when I've had enough (I don't think I ever even get to a point of 'fullness', I stop before then) and I eat an exceptionally healthy diet, not through any desire to be healthy but just because there are so many delicious foods, the majority of them healthy if eaten with as part of a very varied diet, that my diet is naturally 'healthy'.
I'm the least likely person to be 'part of the obesity crisis', (about which you seem alarmed). So I suggest you really do examine your own feelings about food, weight and all that goes with it before you jump on my very innocuous comment.