I am 184 cm (~6') and 62-64 kg (137-141 lbs), have kept this weight range for the last ~15 years. Maybe sharing my diet/sport schedule could help ppl..? I drink mostly water and coffee (rarely but sometimes redbull, beer maybe 1L per week). I skip breakfast most days, eating a small portion of leftovers from the night before and some fruit (apple + orange or whatever is in season) for lunch. Usually I have a after work snack (bowl of corn flakes with a bit of sugar). Dinner is usually around 20:00 and we eat whatever...meat, veggies, carbs, whatever is available that week. For sports I am on the bike for maybe 50-100 km per week depending on how lazy I feel that week. I go climbing (bouldering) 2x per week (usually riding my bike there - makes a 2-3 hour boulder session with 1hr of bike on top). Not sure if the sport would make a big difference one way or the other (if it was there or not), I think eating the right amount makes the biggest difference. However without sport my brain feels like shit so I tend to keep doing it.