How food and drink affect your sleep. What you eat and drink before bed can affect your sleep. For example, foods containing the amino acid tryptophanâa building block of the sleep-related chemical serotoninâcould potentially make you drowsy, although evidence is mixed as to whether the amount in food is enough to change your sleep.
The study estimates lifetime societal savings (net present value) of about $12 billion from the more than 600,000 total knee replacement surgeries performed each year in the U.S. These societal savings primarily accrue to patients and employers.
Among the study findings: 1  Approximately 0.8 percent of Americans are living with a hip replacement, and 1.5 percent with a knee replacement. 2  More women are living with prosthetic hips and knees than men. 3  Prevalence of THR and TKR among adults age 50 and older is as high as 2.3 and 4.6 percent, respectively.