What food has the highest calorie per unit price that you can buy and eat regularly? The food cannot give you any undesirable health effect due to the sole reason that you eat it regularly (say once daily).
closed as primarily opinion-based by anongoodnurse, mgkrebbs, kmm, AliceD♦, fileunderwater Jan 3 '17 at 23:56
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The first part of the question can be answer by simplifying it a bit. Food can be divided into a few base categories
Carbohydrate (eg rice)
Fatty acids (ie fat, butter and oil)
What is the cost of rice? It depends on the quality of rice you are willing to eat. Good quality US rice cost about = $530 Per Metric Ton. Low quality 100% broken rice cost USD 350 per ton http://www.riceauthority.com/prices/
Cost of cheap fatty acid (palm old) = ~$650 per ton. http://www.indexmundi.com/commodities/?commodity=palm-oil
Meat : well it is over $ 1000 USD per ton. http://www.globalmeatnews.com/Industry-Markets/Meat-prices-to-remain-high-as-demand-increases
IN terms of energy per cost... Rice 4 cal per g https://www.google.com/?gws_rd=ssl#q=calories+rice+per+gram
Oil 9 cal per gram https://www.google.com/?gws_rd=ssl#q=calories+oil++per+gram
So in terms of highest calorie per unit price, the winner goes to palm oil.
The second requirement.. is a bit difficult to answer.
Genetics can play a role. Specifically the innuit can have a diet were 50% of their calories is derived from fat, without suffering form cardiovascular problem and starvation from lack of carbohydrate (ie the brain only runs on glucose) https://en.wikipedia.org/wiki/Inuit_diet. How this is possible is debated. Idea include, high levels of animal glycogen in their diet where most meat is eaten raw, a miss calculation in anthropological studies on the amount of plant carbohydrate in Inuit diet, and genetic differences.
Traditional asian diets can have upto 70% of calories derived from carbohydrates. https://hms.harvard.edu/news/lower-diabetes-risk-asian-diet
Pick the fatty acid of your choice, any fat or oil has the highest calorie to weight than any other food. Most fats are fairly cheap, there is a reason fried foods are so fattening. As long as you are eating an otherwise healthy diet all the health risks associated with fats are from gaining weight.