Isn’t that the point? Your body needs calories! Nuts are a great way to get filling healthy calories so you don’t go around eating junk.
M&M’s are 492 calories per 100g, so slightly less than your figure for walnuts, but I can’t imagine that eating candy is healthier. And similarly, steak has many negative health effects.
What are the many negative health effects of steak?
I eat a ~1lb pan fried strip steak with steamed broccoli for breakfast 7 days per week.
It’s the easiest and most consistent way to help me meet my protein and fiber goals.
My GP does my bloodwork twice per year and the only thing he has ever told me is that I need to take a Vitamin D supplement. But he also said that he tells all of his patients that.
Many? There are some, but I wouldn't say many if consumed in moderation, and maybe depending on what animal (elk, deer, vs cow) and how it was raised (grass fed). Most of the negatives are associated with red meat are focusing on saturated fat or on processed red meat. The other type of study is usually looking at groups who have other potential lifestyle factors that might affect the other issues (like diabetes).