Your article title made me think that you were going to discuss the effect that demands on our energy and stress levels have on our calorie and nutrition requirements, but it seems to be more in the line of dieting and providing advice on how to reduce heart disease etc with diet.

If you have not already heard of the book Nourishing Traditions, I highly recommend you read it. I think you would edit some of the advice in this article. For example, saturated fats, per se, do not cause heart disease. The human body requires a certain amount of saturated fat for healthy (elastic) blood vessels. Fat is also necessary for the proper digestion and absorption of certain minerals from green leafy vegetables. This is why the idea of oil + acid (extra virgin olive oil plus apple cider or red wine vinegar) in a salad dressing actually increases the absorption of nutrients from the salad greens. (These are just examples of the incredible depth of discussion included in the book.)

In addition, I recommend you look into Dr. Weston Price’s research of native cultures and their diets, unaffected by Western Civilization. Native diets were untainted with processed food, and generally were high in animal fat. Heart disease was unheard of in these cultures. Children were born with wide jawbones and straight teeth. They did not get cavities. Now, your recommendation on how to prepare meat is spot on. slow cooking, roasting, and broiling is the healthiest way to prepare. Processed (nitrates) meats are right out. Studies that actually differentiate between types of meat preparation also capture the fact that it is the processed meats that are 90% of the problem. Lifestyle and other diet factors also can either make you resist or more susceptible to disease.
Also here is a link to a description of his research: https://www.dietsinreview.com/diets/weston-price-diet/.