I could speak for many on the confusion surrounding nutritional science for those who are trying to optimize their intake for training or other purposes. Getting fats, carbs, and protein is simple enough, along with general recommendations on supplementation like using powdered whey.
The real confusion are when it comes to supplementation, and everyone seems to disagree. For example, I was personally told to avoid whey isolate as it’s apparently mostly not absorbed with other foods, or not utilized after having 40 grams worth of protein. On the other hand, I’ve heard of no such limit on eating chicken breast or pork loin. I still do use it, but seeing similar sentiments on other supplements makes this worse: I eat Vitamin D3, Zinc, and a generic multivitamin but apparently since my multivitamin was pill form it wasn’t utilized (told this by GP). I then got the gummy form of all 3 supplements but it’s impossible to know how it makes a difference. For reference, my new GP says the pill forms are ‘better’.
What made me think of this was learning that “fortified” cereals and other breakfast meals, despite advertising, say, iron as a nutrient in the food actually provide no available iron… I just need someone to explain this mess and where to find accurate information. Of course, all supplements aren’t evaluated by the FDA.
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