Really, the only way to be small is to start small, and even then, it creeps up. I weighed 95 pounds soaking wet well into my 20s. I am still not heavy, and not a large woman, although it's sorta "redistributed" with age; my arms and legs seem to get thinner each year, while the torso gets more resolutely apple-shaped. I eat whatever I want. I'm very fond of bacon and olive oil, and nice bread. My exercise regimen comprises endless hours walking a high energy dog, and yoga, or chi gong, or tai chi (as the spirit moves me; I quite like the "lifted yoga" offered at the local vape lounge, headed by my daughter or her best friend) to keep me flexible-ish.