I think it's more the mental aspect for me. I've always been regimented. It's true that if I found an online diet that gave me a three-day vegetarian plan that said, "eat this, this and this for breakfast, lunch, and dinner." I'd do it.
Instead this Monday I went to the store and bought a ton of vegetables to make myself and they sit in my refrigerator untouched.
So it's really mental more than anything else. Anyway, it's three days. I'm also going to bookstore that has meals for one so I can start planning on cooking quick meals just for myself. I think that's also part of my problem. I have always enjoyed cooking for people who enjoy eating. Usually my daughter would have one or two friends over at least a few times a week for dinner. For some reason simply cooking for me seems a chore... especially when I all my cookbooks serve 6 to 8 people.
Again, it's mental. Could I just alter the ingredients to make it a one-serving thing? Yes. But I know me and I know I won't. So I'll buy a cookbook for one person.