It seems like eating a diet rich in polyphenols promotes good gut health and therefore complete health. There is some consensus that eating at least 30 unique plants per week will achieve this condition. It is important to note that the plants should be the least amount of processed until considered palatable to get the most per serving, so e.g. cooked potatoes over chips.
30 plants might seem a lot per week, though it averages to a bit more than 4 plants per day. It seems the issue of getting variety will exist in poorer nations and/or restrictive diets.
Thus to test this hypothesis will be tracking such plants plus the additional information of processed level (none, some, high) and if from a beverage (beer, tea, coffee, wine, juice).
Any one else who wants to participate, just let me know, so that we can anonymize the data.