Eating a healthy diet is important, but do you need to eat only healthy foods at every meal and every single day? Isn't a treat now and then OK? I certainly think so, and the Academy of Nutrition and Dietetics (AND) also supports the idea of eating certain foods in moderation. That means it's okay to eat something that isn't good for you as long as you only eat a small amount and/or not very often.
Visible at the top of the Hoover Dam, this 'bathtub ring' shows the devastating effects of a drought which has seen the level of Lake Mead drop to an historic low. The lake's surface now sits at just over 1,000ft, the lowest point it has been since it started being filled in the early 1930s when the dam was finished.
Before the filling of Lake Powell (a reservoir of similar size to Lake Mead) behind Glen Canyon Dam, the Colorado River flowed largely unregulated into Lake Mead, making Mead more vulnerable to drought. From 1953 to 1956, the water level fell from 1,200 to 1,085 feet (366 to 331 m).