My friend Judith just lent me Gina Kolata's Rethinking Thin, which i finished a couple of days ago. It's by the New York Times science writer, it's very good, and it's full of study after study and narrative after narrative which say:
1. Weight seems preset just after birth or in childhood in a way we don't understand.
2. It's damn near impossible for anyone who doesn't have some severe hormonal problem to lose more than 10% of their total bodyweight and keep it off, no matter how hard they try, no matter what the diet plan is, and no matter what insane methods they use.
3. As a population we're taller, fatter, and healthier than ever before, and there's a possibility that overweight correlates with but doesn't cause a lot of illness, and there's absolutely no reason that thin is healthier and fat is less healthy.
In unconnected to books news, what looks like your twin girls taking her sister's head in her hands to kiss her may actually be her trying to nurse from the nearest roundish object, and Elizabeth rolled from her front to her back today, which means her plans for world domination are progressing.