Good Day, this is Paulo Perianes, I'm 22 years old, an architect and works full-time. My weight is 120 lbs and my height is 5'7 1/2 ", im just wondering even if I eat plenty, my weight dont change, then last week and today, two of my friends told me that i look thinner, why is it happening? and what should i do? by the way I do smoke, thank you.