1) The modern food production process has diminished its quality. Modern agriculture and intensive livestock farming have meant that foods no longer contain as many vitamins and minerals as they once did. However, they still have the same number of calories.
We are therefore eating foods that "don't nourish us as much as they used to." We need to eat more than our grandparents did to obtain the same amount of nutrients. Soils are becoming increasingly impoverished, and plants produce fruits and leaves with fewer vitamins and minerals.
The animals are fed with feed and grain instead of grass, and this causes their meat to be deficient in some vitamins.
2) The RDA (recommended daily allowance) is not the ideal amount. It is only the amount necessary to not Falling ill in the short term. To optimize health and reach your full potential, combat stress and today's fast-paced lifestyle, the amounts needed are considerably higher than the RDA.
3) Some micronutrients are even more beneficial if taken in larger quantities. This is the case with vitamin C. We are one of the few animals that lack the ability to produce it ourselves, and it is a vitamin that plays a crucial role in the functioning of the immune system.
We lost the ability to synthesize it in an environment where it wasn't a problem, since ancestral fruits and vegetables had a much higher amount than current species. It wasn't a disadvantage, at least thousands of years ago. Today, it's known that under stressful conditions, mammals and humans consume part of their vitamin C reserves. But animals have an advantage over humans: they compensate for losses by self-reproducing vitamin C in their bodies. We don't.
It has been proven that a stressed goat can produce up to 15,000 mg of vitamin C. And do they really recommend we take 75 mg a day?
We, along with most up-to-date doctors and nutritionists, don't see any point in it. And science proves us right.