' 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 can contain nitrates, and over 70 percent of the nitrates the average adult consumes comes from nitrates in natural foods, according to the Agency for Toxic Substances and Disease Registry.The agency indicates that nitrate-rich vegetables do not normally give you dangerous levels of nitrates.egetables can contain nitrates, and over 70 percent of the nitrates the average adult consumes comes from nitrates in natural foods, according to the Agency for Toxic Substances and Disease Registry.