Overall, in each country, one type of grain is the primary source for one country: rice in Cambodia, wheat in Egypt and Poland, and maize in Mexico. Notably Egypt has the most consumed calories from 3 staple grains, while Poland has the least, being the country that has no consumption for cereal, namely maize.
With respect to rice, Cambodia ranked highest, with 1445 calories consumed per person for one day. Following distantly come Egypt at 501 calories per person. Trailing far behind are Mexico and Poland with 57 and 19 calories respectively.
Regarding wheat, Egypt has the most consumed calories at 1095. Poland followed closely by Egypt, with 865 calories. Following some way behind come Mexico and Cambodia, with the former being at 275 and the latter at 18 calories every day per person.
The last remaining grain is maize. Where Mexico is the leader in consumption of maize, with 1083 calories. Egypt comes next with 578 calories, distantly way behind Cambodia with 103 calories. Finally, the country which ranked lowest, with 0 calories, is Poland. This means there is no person who eats maize in Poland.