' 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.
Vegetables and cured meat are in general the main sources of nitrate and nitrite in the. diet, but small amounts may be present in fish and dairy products. Meat products may. contain <2.7â945 mg of nitrate per kilogram and <0.2â6.4 mg of nitrite per kilogram;