It's challenging to provide a comprehensive and definitive list of the 20 food types that sell the most in descending order since it can vary significantly depending on the country, region, and time. However, here's a possible list based on the global food market trends:

Please note that this list is not exhaustive and can vary depending on various factors. Also, it's worth mentioning that the order can vary depending on the region, cultural preferences, and time.

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 Here are the top 10 biggest food supply companies in the USA based on revenue:

Please note that the ranking and revenue of these companies can change over time, and there can be variations in methodologies used to measure their revenues.