How much meat should I buy for 140 people?

I need more information to give you a good estimate of how much meat to buy for 140 people! Please tell me:

* What kind of meat? Beef, chicken, pork, lamb, or something else?

* What is the occasion? Is it a casual barbecue, a fancy dinner, a buffet, or something else?

* What are you serving with the meat? Sides, appetizers, etc. will affect how much meat you need.

* What are the serving sizes? Will you be serving individual portions or buffet-style?

* What are your guests' preferences? Are you serving meat-lovers or more moderate eaters?

Once I have this information, I can give you a much more accurate estimate.