Many items are sold as food with claims of nutrient value and consumed for such, so I will clarify the words and how they are usually misused for the benefit of the advertiser and supply chain.

Food
is no doubt a consumable that has the purpose of providing nutrients, but if something is consumed as food that does not mean the consumer will be able to access and use the nutrients. I'm sure your imagination can think of examples why the nutrients a) may not get extracted from that consumed, metabolised efficiently or at all or absorbed as acceptable fuel.

So until the 'apple' for example has been eaten, or the juice drank, or the nutrients extracted ex-body and injected to the blood, there there is no nutrition for the body to exploit and hence there is no food for the body.

So clearly an apple, or other vegetative matter or animal parts are not food. Food is the useful extraction of 'required' nutrition suitable for the individual habit. I say habit as each person can adjust their diet and become dependent upon certain nutrition to maintain their body ego.

So let's not take about crops as food for nutrition. You will no doubt have heard the phrase 'soldier as fodder in an attaching army' ~ nutrition or ammunition to fight the enemy. And food for thought. So if these item are not absorbed and put to fruitful use by the body, they are not food at all. Unused petrol in the car does not help the car function, it's the combustion of the fuel that provided the value in heat and expansion of solid to gases.

Vegan Diet

Having a non-animal diet for some 54 years and raising six of my seven children as such, one having died before birth, I have spend ' a lt' of time studying nutrition, and an example I will use is the use of sesame seeds.

Sesame

For those unknowing, sesame seeds are very small and have the possibility of being consumed for the purpose of extracting nutrition (food).
They are seeds, they are not food. They can be consumed whole as they are small. They can be ground to a paste called tahini. I use tahini to make a 'milk' like liquid i use to line my porridge bowl and in coffee. I also use it with sugar and maple syrup or malt extract to make 'halva'.

My initial attraction was the seeds nutrition value, specifically the 'high' content of iron and calcium, which in most people is taken from animals via blood in flesh and milk.

The Nutritional Items

I will list the general view of the makeup of sesame seeds that nutrition may be extracted from, noting they are not nutients until they have been extracted and used. A body may store elements of the sesame seed for future use, which may eventually be just waste or poison. However these elements are used the have to be absorbed.

Although my focus was on iron and calcium is soon became apparent that sesame contains a lot of fat and protein, which may provide valuable sources of nutrition. Again, that a seed may contain resouces, they are not food untill those resoucres can be extracted and utilised.

So here is a list in weight per 100g of elements that could be used as nutrion once absorbed, and of course the efficienyl of absorbtion is a critial factor, which is not down to the seed and so cannot be defined or clarifed for any individaul without expansin and prolonged experiment which will provide results very dependent upon the experimental environment especially the mental, emotional and hence physical well being of the subject