' 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.
Sources of Nitrates. Nitrates are not only found naturally in the soil, water and atmosphere, but are also in fruits and vegetables such as broccoli, cauliflower, collard greens and root vegetables.Preservatives, particularly those in processed meats such as hot dogs and deli meats, contain nitrates.itrates are found naturally in the environment -- mineral deposits, soil, fertilizers, seawater and even the atmosphere -- from which they enter the food you eat and the water you drink. Small amounts of nitrates wonât hurt you, but scientists need more research to determine safe upper limits.