What foods spur the growth of man boobs?

There are no foods which cause it.

It's something that any man can have although obese men are more likely to have it

For your "friend"... right... Anyway, nothing you eat or rub on your breasts is going to make a darn bit of difference. If you gain a lot of weight, your breasts will get bigger along with the rest of you, but there isn't any miracle breast growth food, pill, massage cream or anything else. People will tell you otherwise. Those people are full of malarky. Believe whatever you want, but I'm telling you the honest truth. I mean, for your friend, of course, not you... ;)

Yes to all ... But estrogen is usually the thing that came up... Unless you don't drink soy or any soy product then u are low in protein intake.