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.
In fact, hip replacements are expected to increase 174% in the next 20 years, and knee replacements will rise even more -- 673%, according to a study presented at the American Academy of Orthopaedic Surgeons' 2006 annual meeting. Recommended Related to Arthritis.