Jammy2003 said:
Saturated fats found in meat (not found in primary sources of vegan protein) have been linked to various forms of cancer, heart disease and all sorts.
Those links have been frequently and consistently debunked as of late. In fact, now that the mechanisms which cause heart disease in the first place are better understood, it's not only impossible for the consumption of saturated fat to cause it, it actually prevents it by creating more optimal levels of good and bad cholesterol in the blood stream, and by not causing the inflammation which damages arteries in the first place and allows small LDL particles to take up residence in the artery walls. If you'd like to read a bit more about it then check out the book Wheat Belly by Dr. William Davis. He's a cardiologist who looked at a ton of research, lists all of his sources, and has been reversing heart disease in his patients by encouraging them to give up grains and follow a low carb, high fat diet which includes plenty of meat and fat.
And I'd love to see this source that says too much meat can't cause obesity or heart disease. Please, do share.
Again, read that book because it explains the mechanisms behind both in quite a bit of detail. You can also check out the documentary Fathead by Tom Naughton or pretty much anything by Gary Taubes as a place to start looking into low carb diets and myths like the lipid hypothesis.
But to answer your question about obesity more directly, it's pretty much impossible to become obese from over eating meat when you understand the mechanisms by which people actually store fat. First, fat is primarily stored as a result of insulin triggering the storage of blood glucose as fat. This typically will not happen unless blood glucose levels rise to high and we can't efficiently burn it off quickly enough to prevent it being a problem. This won't happen when you eat meat. Protein and fat have no impact on blood sugar levels and can't cause the spikes which trigger fat storage. Only carbs can do that, and only in sufficient quantities. This is why the biggest culprits are sugar and wheat which will spike post-meal glucose levels into the diabetic range for most people, triggering insulin release to deal with the issue. But it's not just limited to sugar and wheat. For someone trying to actively lose weight, even fructose in many fruits can cause problems if they have more than 1-2 servings a day, usually because these peoples hormonal and metabolic systems are so out of whack that they can't handle any sugar anymore, even fructose.
This is a bit of an oversimplification mind you. There are other factors at play in how someone stores fat such as their sensitivity or resistance to insulin and how readily their body will tap into fat stores for energy if needed, but the gist is that obesity, heart disease, diabetes, etc. all stem from over consumption of carbohydrates. Even worse is that carbs such as wheat and sugar will stimulate appetite and make people crave more when their blood sugar inevitably crashes creating one hell of a vicious cycle. Not only will that not happen on a low carb diet which includes plenty of meat and fat, but they provide greater satiety after consumption and more consistent energy levels throughout the day. Many find they can go hours longer between meals without eating and be perfectly fine because their blood sugar is under control and their body is utilizing the fat for energy instead of carbs.
You're arguing against points I never made. I never claimed wheat to be the messiah of foods, nor sugar,
No, but you did try to equate a simple concept such as conservation of energy to a complex system such as the human body which runs on more than simple calories, and argue that cutting out animals is more efficient because it loses the middle man. Your post also implied to me that you were arguing people would be better off if that 1/3rd of the worlds grain went straight to people instead of animals. But since that wasn't your intention I apologize for the misunderstanding. But the reality isn't as simple as you made it out to be, and ignores that animals are a very efficient source of protein, fat and nutrients we outright can't get from plants with any efficiency, and is certainly the more optimal choice since a diet including meat, particularly in larger quantities than the USDA recommends is much closer to the diet most people, particularly of European descent, have been eating for millions of years.
I said "a lot of people in this world could do with a lot less meat, and a lot more veg". I never claimed RDA gave you exactly what you wanted, only pointed that if in one meal I obtain more than 160% of the apparent minimum (which could be higher if I'd had pepperoni instead of cheese), then there is probably something wrong there. That was all.
I agree something is wrong there, but what's wrong is that the USDA pulled nutritional recommendations out of their ass and are often swayed by the whims of whichever lobbyists have the deepest pockets. The best research out there does not support their recommendations.
I mean look at it this way: of the three major macronutrients, protein, carbohydrates and fat, there is one that humans can get 0 of in their diet and be perfectly fine. I'll give you a hint: you're not going to find much of this macronutrient in a steak. So if we can thrive on diets with 0 carbs (the only down side being you're not going to run any marathons on 0 carbs), then why do the USDA recommendations call for eating the bare minimum of those you need to live, while recommending around 300g of carbs a day, most of that in the form of wheat based products? The answer, quite simply, is the people making the nutritional recommendations also happen to be paying pretty big subsidies to grain farmers. Wouldn't want all of that government money to be wasted on crops no ones eating I suppose.