if they could get away with it.
Never mind that there is no evidence to suggest that it has anything to do with health in reality.
If you look at the rise of heart disease, obesity and diabetes, and correlate it with the foods we consume, you will find a few interesting facts:
1. Animal fats and protein have always made up a large part of a western diet. Farmers have ALWAYS eaten very large percentages of animal fats and protein (including eggs, milk, etc.) Yet there is no correlation to be found there with these problems. These foods were absent from the far-eastern diets primarily due to the poverty that the Chinese and related cultures live under, and the stunting of those people's growth through the lack of animal protein in their diet is well-documented. No, soy does not make an adequate substitute.
2. Vegetables were only available at certain times of the year, and the availability varied widely depending on where you were and what time of year it was. There was no distribution system to bring you bananas from Chile, for example. You wanted some form of vegetable or fruit, it had to come off a bush, tree or vine pretty much now, because shelf life was extremely short and refrigeration non-existant. A vegan lifestyle was IMPOSSIBLE for these reasons.
3. What DOES correlate with the rise of these disorders is (1) the outrageous growth in consumption of refined sugars, and (2) the introduction of "manufacturered" fats such as margarine and other "designer foods", along with people, including so-called "nutritional experts", telling us all to eat THOSE instead of animal fats such as butter!
If you look at someone who is on a monitored Atkins diet, for example, you will find that their triglyceride levels actually go DOWN, yet they eat damn near nothing except animal protein and fat! How's that possible? Also, their LDL/HDL cholesterol balance IMPROVES! Again, how's that possible?
Its possible because the problem metabolically IS NOT consumption of animal protein and animal fats. In fact, some of those fats and acids, such as Omega-3, found in fish, are amazingly beneficial to the heart and other organs.
It is the consumption of MANUFACTURED sugars and "artificial" fats that correlate with the rise of these problems.
When you consume excess glucose (in the form of these sugars or high-glycemic-index starches and other foods) AND lots of animal fat, the glucose provides ALL of the energy your body needs. Your body, being a machine that will protect against catastrophe caused by loss of the food supply, will store the extra fat - and you thus GET fat! Well duh! Don't do that!
You want to lose weight? Get ALL the refined sugars out of your diet, and ALL of the manufacturered crap out, eat both animal products and fruits/vegetables until you're satiated (not stuffed) with no more than six hours between meals while awake, and your weight and body function will normalize, provided you haven't trashed yourself too severely already with insulin resistance or similar internal problems.
The "vegan way" is not how you find health. Fats are ESSENTIAL to body chemistry, and so is cholesterol. In fact, if you've made any study of biochemistry AT ALL, you know that without cholesterol metabolism at the cellular level is flatly impossible. It is almost almost impossible to get a healthy mix of nutrients from vegetables alone, particularly B-complex vitamins, which are absolutely essential to metabolic regulation, and the amount of counting of nutrients and attention necessary to balance a vegan diet requires near-anal attention to portion control along with exactly WHAT is on your plate.
Be careful with the "one true way" nonsense. It is definitely not true and can be outright dangerous to to your health.