There has been a surge in interest in the use of full body MRI (magnetic resonance imaging) scans as a screening tool to spot early signs of disease. Influencers and celebrities have posted about their experiences, creating an additional buzz around these screening interventions. At a cost of up to $2,500 the scans are touted as a tool to catch medical problems, such as cancer, at a stage when they can be treated. Unlike X-ray and CT scans, MRI does not involve exposure to radiation. To...