My dad just died of cancer (diagnosed stage 4 at 58), the research is strongly in favor of avoiding animals and animal products as food as a way to avoid cancer.
I'm also pre-diabetic. So restricting carbohydrates has done a great job of limiting my high blood sugar.
I'm I'm using a food-scale to make sure I consume 1500 calories a day and doing cardio, 1 hour a day, 600 calories, except Wednesdays when I stand up at work for 6 hours.
But that means a LOT of almond butter and avocados. I'm losing weight quickly too... and i'm not all that hungry: But the nausea is obnoxious.
Sorry to hear that man
If you haven't seen it already, check out the video "Forks over Knives":
http://www.forksoverknives.com/
Also watch "Fat, Sick, and Nearly Dead":
http://www.forksoverknives.com/
While I don't agree with everything in those videos, I do think that adding more veggies into your diet is a Good Thing. I've tried out a variety of diets over the years: paleo, vegetarian, vegan, raw vegan, fruitarian, IIFYM, etc. They all work pretty well if you do them right (like with 100% vegan, you need to add B12, and it's not something you can absorb via a pill, unfortunately).
If you're open to suggestions, I would recommend a couple of things: for starters, IIFYM (if it fits your macros) is the best food-power calculator I've worked with to give you an idea of how many calories & how much protein, carbs, and fat grams you should be eating per day. I'd suggest running through a free online calculator to see where you should be for your macro & calorie numbers, especially with all of the fat you're eating (even though it's healthy fat, eating a lot of almond butter & avocados is going to give you an enormous load of fat in your diet). Second, rather than just zeroing out your carbs, look into fiber in relation to diabetes (both high-fiber diets as a risk-reduction method & in terms of how fiber affects your daily carb intake numbers).
Third, you mentioned losing weight - simply being overweight puts you at risk for diabetes, so not only do you want to lose weight, but you're also going to want to build a new lifestyle in terms of eating that is sustainable long-term so that you don't gain the weight back & also manage your pre-diabetes. Going vegan is one way to do it, but keep in mind that it requires a lot more thought, prep, and planning to do it properly, and also limits you in a lot of social situations. It's totally doable, but if you're still open to being an omnivore, I'd suggest simply reducing your animal protein intake rather than totally eliminating it. For example, instead of a double-bacon cheeseburger, go with a single-patty burger with lettuce, tomatoes, pickles, etc. to kind of balance the meat out. Basically, put it in more of a minor role than a major role. If you are set on going vegan, or at least want to include more delicious vegan recipes, let me know as I have a truckload of them. You can make some amazingly delicious food without meat!
It sounds like you've gotten a wake-up call in terms of health & are actively working on losing weight, improving your diet, and managing your healthy to avoid diabetics, so congrats on being proactive about that! I would definitely look into stuff like IIFYM, fiber intake, and even re-introducing meat into your diet as part of your long-term health strategy. There's a lot of confusing information out there & it's easy to get overly-excited and go down a path that isn't going to give you the best results. There are people here who can give better advice than I can, but definitely check out some of things things listed above to help refine the path you're going down.