Dont go with them anymore. I wouldnt.

I would say something to him, but that's just me. My sister-in-law used to do the same thing, she would make several trips to the buffet and just eat a couple of bites off each plate. I just told her that just because there was plenty, it was no excuse to be wasteful and becuase of people doing things like that the restaurants were forced to raise their prices. It is wasteful, inconsiderate and embarrassing.

Accidently spill some piping hot coffee in his lap.when he runs to the bathroom put the food back

He's paid for the food on his plate, what he choses to do with it after that is his business. Why is his eating habit any of your business? I certainly do not think you should discuss it with your friend. I think the strength of your reaction to this says more about you than it does about him. I suggest you concentrate on that.

each to his own.

I have gone out to eat with a couple. The husband is totally rude and demanding with the waitstaff to the point of him seeming almost psychotic. One time this guy didn't harrass the waitstaff but told my husband that his Enchilada Mole looked like diarrhea. Having had these awful experiences with him in the past, we have decided if he and his wife ask us to dine with them, the answer will be "Sorry, no can do".

The issue here is wastage of food. The plate will just be thrown! please see the pic attached.

Wait until the next time he does it and comment directly to him - "isn't that a terrible waste of food when people are starving in the world". I don't think this is something worth making a big deal of.

It is annoying, but it is not your responsibility and you don't need to feel you have to do anything. If it is embarrassing to have him do that when you go out together, you could cut back on that. I suppose if you wanted to continue, you could say something, but it all hinges on the level of permission in the relationship that is granted by all parties to say such things.

Nope, just eat yours and let him do as he wishes. Maybe as a child he didn't get what he wanted or went hungry often. Let him work it out himself.

You should either ignore his behavior or cease putting yourself in similar situations with him. He's only hurting his own wallet. To all those bringing up world hunger as a reason to confront this man, I would point out that the amount of food he does or does not take never directly affects any starving child. Being offended only on principle is not a good enough reason for the OP to put herself in an awkward situation. I do agree it's a perplexing habit and a shameful waste, but be realistic. As I said, the only one directly harmed is himself for wasting his money, but there's no law against being stupid. Future customers of the restaurant will be indirectly harmed (because of rising prices) long before starving people in foreign countries, or even in that city, would be harmed.

No matter how close you are to your friend, I don't think it is appropriate to tell her, unless she asks your opinion on the subject.

It's up to him what he eats on his plate. It's no different than ordering something off a menu and then not eating it all. I'm pretty sure that, as adults, we would not appreciate being told what to eat and what to do with our food.

This may be a bit rude, but try talking about the situaiton in Darfur or starving children and developing countries...that is, if he likes to talk about politics at the dinner table. Or you may have to come right out and ask "Why do you get so much food and eat so little? You know they just throw all of that in the trash afterwards. Kind of a waste, isnt it?" of course, simle and dont seem liek youre scolding him (esp. if he's sensitive). Edit: I just realized you said your sisters husband, well then you may want to drop it unless it gets worse. Or try askign your sister why he does it. Maybe after the meal you can ask 'Are you going to get take-out too? I mena, its so much food to throw away". Maybe thatll work. Its a bit more difficult when its not your husband.

From an etiquette perspective, you should keep your yap shut. It is considered rude to mention a person's faults (unless they are causing direct harm to someone) in a public place. Likewise it is HIS flaw, not your friend's and I wouldn't bother to speak to her about it, because she has no control over his thoughtless behaviors, he is an adult and responsible for his own behaviors. As suggested, there is no telling what prompts him to behave in such a manner...assuredly there could be some mental/emotional baggage that prompts him to be so rudely wasteful. It would bother me too. If you choose to speak about this, I would suggest that you address any comments, questions, or thoughts directly towards him. From a polite perspective this would take place when you are not near others, so as not to cause undue embarrassment. I would probably have to ask myself one question... Do I wish to speak of this because it truly disturbs me because I KNOW there is no real excuse for any human or animal to starve, or go to bed hungry because there actually IS enough food on this planet to feed everyone... OR is he generally such an ass that him doing this just further pisses me off and I'd like to call him out on it...and don't care if he is put out by my comments or not! Either way the possibility exists that one of two things will happen... Either he will have a heart to heart with me, and may become more aware of his behaviors..and perhaps curtail this particular wasteful trait... OR He will become pissed off in turn, and either refuse to dine with us as a member of the group...or even make his wife uncomfortable enjoying our company. It sort of comes down to HOW STRONGLY this disturbs YOU, and what you are willing to risk in mentioning it to HIM.

if you dont own the buffet dont worry about it.

If you want to address it at all the correct answer is to take the food he doesn't eat to-go at the pay-per-pound price offered by the buffet for your dog. It is the correct thing to do for the buffet, your dog will love it, and the culprit will likely stop. Since it is for your dog it is not overly rude.

Is it food that you've cooked? If not, I don't really get why you're so bothered. Maybe he intends to eat it all, but then he just doesn't. I wouldn't think he goes out of his way to take loads of food and deliberately not eat it.

Parties are for having fun, not for being made the butt of jokes or discovering that (maybe for years) people have secretly wondered about your eating habits. IMAGINE FINDING THIS OUT! If he ate it, you'd be okay, assuming that he'd had an excessive fat man's good time! Assume that the food was an investment in his good time. LET IT GO. Otherwise imagine the consequences and the future after your big "discussion." He may be hurt, embarrassed. You may not WANT to know why he does this. He may not want you to know. Will he ever come to another party with you again, knowing that you are watching how he eats? Will he be able to be himself? Everything could all work out or not. Why risk embarrassing a friend?