' 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.
Sodium Nitrite and Sodium Nitrate in Food. Used as a preservative in meats, these chemicals may pose a cancer risk, although the evidence remains controversial. One recent study raised fears that nitrites and nitrates could interact with medications to damage DNA and increase the risk of cancer.