' 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.
Nitrates can be found naturally in some vegetables, including cauliflower, broccoli and collard, and they are used as preservatives in cured meats, such as deli meat and bacon. Drinking water is also a source of exposure, particularly well water from contaminated or shallow wells.