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twisted You're goddamn right!

Truest words ever spoken by a penguin.

no I do not think eating tentacles are wrong at all

While the apparent reason that it is wrong is the old fashioned concept that [man+woman=natural, all other combinations=unnatural] there are various reasons that have actual value to them.
1. Tentacle beasts basically spend their time roaming about looking for any woman they can find. The rest of their time is spent- well, if you don't know about that I won't go into details but every time you eat a tentacle you're eating the juices of every girl that tentacle has had it's way with. That sounds kind of appealing but in this day and age we have alot of nasty virusses that can make their way into your system if you give them direct contact with a moist membraneous surface. (Most of the fighting proper just say that you don't know where that's been with the traditional sense in mind.)
2. That's a monster. You shouldn't eat that. You can make it into armor or maybe some snazzy clothing if it's colorful but don't eat it.
Just skip to the collored text if you are familiar with oceanic mercury poisonning or don't care to read about it.
*Background info* I'm sure that we all know about the origins of monsters (but if not shame on you, go sit in the corner and read the book of Jared to educate yourself,) and as such they are evil. [/background-info]
Now, this may not make sense to everyone so I will relate an environmental issue to it.
[hippyconcerns=on]After all of the years we have dumped our wastes into the ocean there has come to be a noticable ammount of mercury in it. As things are the mercury in the water wouldn't cause much harm to a person but an interesting thing happens to the fish. Most food-chains in the ocean have those tiny little water-organisms that grow and reproduce very quickly at the bottom. A fish need to eat about it's half it's body wieght of whatever it eats every so often to stay alive
(This part is where the point is)
but because many fish eat those fish and big fish like tuna eat the fish I was just talking about the mercury really builds up at the tops of the chains. If we didn't eat these fish only hippies would have reason for concern but we DO eat them and now we are practically eating rectal thermometers along with our fish every time we eat fish. That's just disgusting. [/hippyconcerns]
So if you continue to eat the tentacles the terrible evil will build up until it dominates your personality and then you WILL be one of the types of monsters we have to kill. (This even applies to humans.)
So while eating something weak like a slime won't have much affect* eating the more powerful monsters is a major no-no.
*I do not condone the consumption of slimes even though dead slimes are nearly indistinguishable from jello if cut into a cube.
3. It's a monster. Only the professionals can really be sure that it's dead. Do you want to just invite it in to wreak havok on your stomach and maybe other organs?
NOW do you understand?

To Fighting Proper: If I left out any major issues with monster consumption please let me know.

"You are what you eat" takes on new meanings when dining on monsters. Really.

... You missed the memo, didn't you? stare

gonk s**t... another one?

I need a secretary or something. sweatdrop