Let's say I sang high Barritone, and if I lost fifty pounds would I lose some of my abilities possibly as a result fo the weight loss?

I think so, cuz fat people seem to always have a good voice.

To be honest, I really have no idea, scientifically speaking, but I will tell you this- between graduating from college and now (4 years) I have gained almost 20 pounds (Went from 115 to 132), and while I'm a little sad about my new thighs, I have seemed to have gained some tremendous singing abililty. I have always been a decent singer, on key and everything, and I've been singing in choirs, etc. since I was a little girl, but in these past few years my voice has gotten so strong and powerful and it has lowered from soprano to like mezzo soprano or sopralto and now it's all cool and has a nice vibrato to it. I'm not sure if I can thank my weight gain for this or if my vocal chords just kind of matured or something, but all I know is I am quite a good singer now, whereas I was only sort of passable back in the day.

NO! How much you weigh has nothing to do with the type of voice you have. When Pavarotti lost a bunch of weight his voice was still marvelous, the same goes for Deborah Voight. Keep working on your skills and you will be even more desirable as a performer.
http://www.deborahvoigt.com/

If you lost a lot of weight through exercise, particularly to your core muscles, your vocal abilities might change because you'll have more breath support. However, weight loss doesn't usually affect the timbre or pitch of your voice.

yes

When I have lost weight I got better. The better physical condition you are in, the better you will sing.
There are lots of myths about size and singing, and that's what they are-myths. A lot of people point to Maria Callas who is said to have sung better when she was heavier, and got worse when she lost weight. It's more complex than that, I think. The same difficult "life issues" that motivated her to drop weight radically (and unhealthily) caused her singing to deteriorate, IMO.
Stay singing, eat a healthy diet, and you should be fine!

Technically, yes. It would be more evident in women than in men, because the larger a person is, usually the more estrogen is in their system, and estrogen is part of the hormone fluctuation that causes inflammation, and that happens all over your body.
So, as the level of estrogen drops, the testosterone becomes more effective, allowing for richer low pitches. If you continue singing, you will be able to retain the high notes.
But, more than anything, you would be likely to notice a difference in stamina, and the voice might be heard as more energized, but that's a stretch and not always true, especially if someone studied opera, vs just "classical voice" or something else.

Yes it can, why do you think Opera Devas are so big!