' 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.
Among commonly eaten vegetables, beetroot, celery, lettuce, spinach, and radishes have the most nitrate. There is often a tenfold variation in nitrate levels of the same variety of vegetables sampled from supermarkets.he amount of nitrate in plants is determined mainly from its genetically based metabolism, the age of the plant, and the amount of available nitrate in the soil. Leafy green vegetables and some root crops contain the highest concentrations of nitrates.