In general, my good sense rebels at the notion of connecting bodybuilding with health. Bodybuilding is the game of hacking one particular, and particularly superficial, way of judging health and fitness. That's fine and good -- anything that gives people fun and satisfaction is great -- but there are many other ways of judging health and fitness that seem prima facie far superior to an obsession with body fat and muscularity. And there are many people busy hacking those superior measures: triathletes, powerlifters, soccer players, boxers, wrestlers, tennis players, and so forth. You have to assume that nutritional knowledge in those sports is pretty far behind bodybuilding before you would assume that an ideal powerlifter's diet is as healthy as an ideal tennis player's diet.
Strength is perhaps the single best predictor of longevity and health. That's not to say vigorous strength training has been clinically shown to increase lifespan, but strong people are much healthier than weak people overall. Geriatric care givers get dramatic results out of strength training. I don't think one can make a similar case for jogging or tennis, or whatever. Strength training has uniquely powerful benefits.
"Body Building" as an aesthetic goal or a "sport" is stupid. But there a ton of reasons to think everyone should try to keep up a respectable ten rep bench/squat.
Can't say I agree with listening to bodybuilders though. Bodybuilders are (generally speaking) genetic freaks who are taking exogenous testosterone, HGH and insulin. They're also using training/diet programs appropriate for people who're in their circumstances.
I really suggest doing some research.
Weight training requires 3 things:
1. Proper nutrition and eating habits.
2. Proper sleeping and recovery habits.
3. Proper weight training regimen.
Most people almost never listen or bother to do. For some reason they have an aversion to taking advice from body builders even though those guys spend more of their time on fitness and nutrition than others.