' 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.
Hereâs how to keep added nitrates and nitrites out of your body: 1  Minimize your consumption of processed foods and cured meat products such as hot dogs, sausage and cold cuts. 2  Check labels carefully and avoid products that list sodium or potassium nitrates and nitrites. In addition to lunchmeat, some canned beans and vegetables with bacon, and even packaged seafood, may contain these added chemicals. Eat organic food.