Does doing daily crossfit excercises and eating a paleo diet consisting of lean meat, vegetables, etc. reduce heart disease?
closed as off topic by michael, JohnP, Dave Liepmann, Baarn, VPeric Oct 6 '12 at 15:43
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Yes, no and maybe.
Unfortunately, that's going to be about the best answer you will get. Exercise has proven to be a heart disease limiter, and certainly reduces the risk factor of obesity (Assuming you don't eat massive amounts and stay fat), so in that sense, yes, it can reduce heart disease. But, if you still smoke and/or eat a bad diet, it's not going to be a cure-all.
As far as the paleo diet, it's another "fad" diet in my opinion. It's an attempt by people to find a short cut to maintaining a healthy weight. Eat a balanced amount of the macronutrients (carbs, protein, fats), with an emphasis on healthy fats (avocado, nuts, fish oils, healthy cooking oils, etc) and a variety of fruits/veggies, and you should be fine.
Note, you will need to tweak your diet slightly (or possibly majorly) if you have sensitivities such as gluten, lactose intolerance, or other digestive problems, or if you need more of a macronutrient for athletic purposes (Endurance athletes need a higher percentage of carbs than a powerlifter for example).