R.J.
Not sure about the "canned" version of this diet... but as an anthropology student: farmed diets are extremely limited, compared to the extremely diverse diets that were eaten for apx 60,000 years during the hunting/gathering majority of human existance.
Typically, the more diverse one's diet, the healthier one is... since one is ingesting a wide variety of nutrients from many sources.
Catch22 : It's almost impossible to actually have that kind of diverse diet in our agricultural world.
Why? Because we buy our food from the store.
Maybe 20 kinds of meat/fish on sale... instead of the 500 or so that are on the hoof, foot, clamp, and fin. Maybe 100 types of plants on sale, instead of the 10,000 or so edible kinds that are out and about in nature.
Even the wealthiest of us, just usually can't mimic the bionutrientdiversity that was / is available in the wild.
If one is fairly well off, though, one can mimic to a certain degree. Buying 'game' meats, every single kind of fresh seafood available, shopping at all the ethnic stores, etc. But it's still extremely limited compared to what our ancestors ate.
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If the canned version of this diet is just "cooking from scratch"... then, yeah. All the benefits of cooking from scratch. IF the ingredients are varried enough, and IF they're prepared well (so the volatile nutrients aren't destroyed, and the 'locked' nutrients are released), and they keep the ingredients rich and balanced... then what one gets is a diet that won't have a lot of nutritional deficits. HOWEVER; there are a lot of nutrients that are not readily available UNLESS one supplements. I don't eat idodized salt. But that's becuase I (on purpose) get my iodine from seafood sources. When I can't afford seafood sources rich in iodine, durn straight, I need iodized salt.
This is a problem with many faddish kinds of diets. Option A being super healthy... except when it's NOT. When it's not healthy, is something very few diets go into. So people often end up UNhealthy, because they don't know the exceptions to the case.
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In general, though:
Good nutrition from a diverse and balanced diet helps EVERYONE.
Good nutrition from a diverse and balanced diet is particularly needed in those that have more demands on their body than others (athletes, people with medical issues, etc.).