' An Act to preserve daylight and provide standard time for the United States ' was enacted on March 19, 1918. [See law] It both established standard time zones and set summer DST to begin on March 31, 1918. Daylight Saving Time was observed for seven months in 1918 and 1919.
Nitrate-rich foods include lettuce, parsley and spinach. âLeafy vegetables contain chemical nitrate that improves heart health,â the Mail Online reports. In a recent study, researchers looked at the effects of a nitrate-rich diet on rats.
Nitrate Allergy Symptoms. Nitrate is the chemical compound found in various foods. It is used as a preservative for foods. Nitrate allergy symptoms are found in some people by eating processed foods. The people who are sensitive to this chemical might suffer serious headaches to migraines due to nitrate allergy.