An article from JAMA Network reports on a pilot study investigating lithium's potential in the treatment of Alzheimer's disease, paving the way for larger testing. The EPA (Environmental Protection Agency) has reassessed its stance on heavy metal air pollution and its health costs. The article also addresses gender differences in the effects of GLP-1 drugs. The link between healthy eating and the prevention of cognitive decline is also emphasized. Other topics include the rise of colorectal cancer in younger adults and the prevalence of long-term consequences of COVID-19. The article also mentions the influence of bacteria on the formation of kidney stones.