A 73-year-old woman presents to your clinic complaining of unintentional weight loss. She reports having lost 15 lbs (6.8 kg) over the past year. Previously, her weight was 135 lbs (61.3 kg) and now it is 120 lbs (54.5 kg). She reports that she is eating three meals per day as usual.The patient's past medical history is notable for osteoporosis, a left hip fracture three years ago, osteoarthritis, hypothyroidism and hypercholesterolemia. She is taking levothyroxine, a statin and a bisphosphonate plus vitamin D and calcium. She recently started taking nonsteroidal anti-inflammatory medications (NSAIDs) as needed for knee pain. She is an exsmoker and does not drink alcohol. On examin ation, her weight was 121 lbs (55 kg), with a body mass index (BMI) of 22. She also had osteoarthritic changes in the knees. Results of investigations, including radiograph of the chest, complete blood count, electrolytes, creatinine, thyroid stimulating hormone and albumin are within normal limits.