' 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.
These foods may contain added chemicals you should know about: nitrates and nitrites. Manufacturers add nitrates and nitrites to foods such as cured sandwich meats, bacon, salami or sausages to give them color and to prolong their shelf life. In addition to lunchmeat, some canned beans and vegetables with bacon, and even packaged seafood, may contain these added chemicals. 2  Eat organic food. 3  Synthetic nitrates and nitrites are not allowed as preservatives in organic packaged foods and meats.