In modern language meaning, ‘healthy’ food is assumed to be low fat. But for all of time before now, one needed food with high fat content or one were dead. In fact primary things one needs are salt, sugar, protein and fat. Also many other subtle things like vitamins. After all, Is not the brain, physically a giant ball of cholesterol? And anecdotally to look at the supermarket one can see the most popular isles are containing products offering high amounts of salt sugar and fat.
Apparently meat contains salt, and so carnivores get their salt from meat, and apparently herbivores get salt from vegetables, and eating dirt. There is footage on Youtube of mountain goats climbing up a dam wall to access an area where salt seeps out and they risk life and limb to go up there and lick the salt off the stone dam wall. No salt, means no life. So in worst case scenario one can at least get enough salt from eating meat. If one is near the sea or an inland salt lake one is well supplied.
Beans have a lot of vitamin C and Magnesium. Less chance of scurvy for bean-eaters. Beans also have a lot of calories. Im impressed with beans. They also have a lot of protein. Im also excited about the vitamin C content of potato – it says 32% of your recommended daily intake (RDI) in every 100grams of potato.
Rabbit and Kangaroo are very very very low in fat-content. They have like 1% fat. Thats not enough to sustain life. Still, they have protein and in nature documentaries one sees wolves chasing snow rabbits, so Rabbit must have some value, but I stress they are low in fat. Actually take a look at the iron content of all these meats: You can see Rabbit has a whopping 27% of one’s daily iron requirement in every 100grams.
The traditional farm raised meats Beef, Mutton, Chicken, Duck, Goat, Pork, are all really excellent sources of fat. Beef for example has around 6.5% fat.
The power of such livestock is to turn grass and hay into fat. If one has some extra fat on them and one stops eating, one can burn the fat until its all gone and one will actually survive just fine on that, energy-wise, but one would still need to replenish essential vitamins and so on. If one were 20Kg overweight, in a no-food survival situation, that extra energy might take 3 weeks to burn away. And that is the actual sublime usage of body fat. Fat is energy. Fat is the same to a mammal as a battery is to a battery powered product like an electric shaver, or a torch. Fat is a battery. You got fat then you have energy.
One main concept in diet is how if one has enough of most things, but one lacks just one thing that is an essential thing, then eventually one might perish. For example, sailors of long sea journeys would sometimes die from Scurvy – a lack of vitamin C. They had food, but needed a source of vitamin C. They started bringing pickled cabbage and citrus trees on the long journeys. This solved the Scurvy once and for all. TLDR: Just because one has 1000kg of baked beans or rabbit meat, doesnt mean you can survive on that.
Iodine is another thing that comes to mind. In some parts of the World where there can be uncertain nutrition continuity, one can see people with gigantic bulges under their jaw/neck area, its called a goiter and it is enlarged thyroid glands from lack of iodine. I hear seaweed is the ultimate iodine source, but generally we are talking fish and dairy. Also supermarkets may stock iodised salt.
Looks like Wheat is good for carbohydrates, and surprisingly it also has high amounts of protein and iron. Wheat has fallen out of modern day vogue, but the most common trip to the shops is still to get milk and bread. What actually is wheat? Its a long grass that when in seed, produces the grass seed that we eat ground up to make flower, to make bread and cake and etc.
Another key concept is that someone who is mal-nourished can be known to make poor decisions and to not be able to do much physical work. So good nutrition, in perpetuity, is a virtuous cycle, where good food begets clear thinking and ability to work hard which begets good food…
Further, a good rule of thumb, is if one continues to eat the stuff they usually eat and like, then one will most likely continue to be healthy, even in long sea journeys and prolonged survival situations.
Witchetty grubs, for instance, are an ideal survival food, being rich in protein (15% by weight), fat (20%) and energy (~1170 kilojoules per 100 grams). Witchetty grubs are also valuable sources of vitamin B1 and the essential minerals potassium, magnesium and zinc