How do you decide when an older patient's weight loss warrants an extensive workup versus a more focused or watchful approach?

I always start with the standard cut off of 5% of normal body weight in 6-12 months. If this cut-off is met, then I probe about intentional or unintentional. Many older adults are not eating enough protein (they need more than the RDA recommendation) -- I encourage 1-1.3 (sometimes 1.5) g/kg protein...