Yams or potatoes, and butter do not satisfy all nutrient needs. In particular, assuming a 2500 calorie intake, that kind of diet would be deficient in vitamins E, K, B2 (riboflavin), B9 (folate), B12, calcium, zinc, manganese, selenium, protein as well as essential fatty acids alpha-linolenic and linoleic acid. Compared to potatoes, yams also lack Vitamin B3 (niacin), although a 2000 calorie portion of yams provides the recommended daily amount of manganese.
Butter contains practically no micronutrients so I have no idea how you figured that butter is even relevant. Butter only contains significant micronutrients if it has been fortified. Then you might as well take a supplement instead.
>>7375434 >Academic discussions should be taken to /sci/ I went on /sci/ once and there was a gigantic thread about whether or not keeping one's body in shape is relevant in these modern times. I haven't been back since then and wouldn't recommend anyone to go there
>>7375549 Both of those things are wrong though. All of the nutrients I listed are found neither in butter nor in potatoes, in amounts that would be nutritionally adequate. Butter is a poor source of vitamin B12. It would be much more intelligent to eat eggs instead of butter, if one were to consume as limited a diet as possible.
Most foods have "tiny amounts of everything", but you need to consume a specific amount of each nutrient in order to meet your requirements.
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