Body odor

Do you have body odor? Or do you know of anyone that has it? If you do have it, normally u wont notice it until someone tells you that you 'smell' funny... LOL. What causes body odor? Does your diet in any way affect it too? I'm not sure... but from my point of view, I think your diet does affect it more or less. Your personal hygiene and the 'environment' (workplace or house) you usually stay in sometimes will 'drag' the smell with you too... :P What do you think? Discuss!