National Soylent Green Day and National Sourdough Bread Day in USA
National Soylent Green Day and National Sourdough Bread Day in USA is held on April 1. This event in the first decade of the month April is annual. 
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Soylent is supposed to represent soy beans and lentils. Soylent Green (1973) was a cautionary science-fiction tale that featured Charlton Heston as a 21st-century police.
Sourdough is the oldest and most original form of leavened bread. The oldest recorded use of sourdough is from the Ancient Egyptian civilizations. It’s one of the least processed breads you can eat. The starter is rich in both prebiotics and probiotics. It has a lower glycemic index than conventional bread.
Similar holidays and events, festivals and interesting facts
National Oysters on the Half Shell Day and National Clams Day in USA on March 31
Taco Day in Mexico on March 31 (Día del Taco);
National Jam Day in United Kingdom on March 31
National Coffee Day in China on April 1
National Peanut Butter and Jelly Day in USA on April 2
National Chocolate Mousse Day and Fish Fingers and Custard Day in USA on April 3
National Cordon Bleu Day in USA on April 4
National Burrito Day in USA on April 4