Your kidneys are complex organs. They regulate the amount of water lost from the body and get rid of waste products, especially urea. Urea is made when any excess amino acids are broken down in your liver.
Middle Class Income for a Family. The annual average income for a middle class family of four is approximately $70, 354. This is based on a 2006 report by the U.S. Census for a family of four. This figure is in the middle of the range of incomes for this section of the population. The median income during this time for all households was $48,561.
Here's how much you have to earn to be considered middle class. The American middle class keeps shrinking. The share of American adults in middle-income households also decreased, from 55% in 2000 to 51% in 2014, Pew Research Center reports. At the same time, the share of adults in the upper-income tier increased from 17% to 20%. Although income is just one part of class, it's a crucial element and the one that's easy to measure and track. So just how much do you need to make to qualify as middle class these days? Pew, which defines middle class as adults whose annual household income is two-thirds to double the national median ($55,775 as of 2016), details the national middle-income range for various household sizes.