48, 6'4", 175 lbs. Very little muscle. I run a lot and, every morning, roll onto the floor out of bed for push-ups and sit-ups. I crawled up into the 180's several years ago. I was chatting with my uncle about it and he mentioned the docufilm Forks Over Knives, which is heavily informed by his Yale friend, '56 Olympic rowing teammate and eventual boss of the cardio department at the Cleveland clinic. The movie emphasized minimizing sugar and animal based protein and maximizing Whole Foods and fiber (<--I love how the iPad autocapitalizes "whole foods"-- Capitalism!). I went back to 172 - 176 and haven't varied out of that range since.
Anyway, my faimily and I (and nearly the entire population of their origin, Japan) are heavy carb consumers. I go through 2 - 3 cups of white rice a day. We in the West rail against carbohydrates while we suffer the worst rates of obesity and heart desease in the world adhering to diets that avoid them. Makes no sense.