Evidence Lead Even Worse Than Thought 
While lead has long been known to be toxic, it appears that it is much worse than even most current estimations would gauge. A recent paper in The Lancet, which has been lauded by experts in the field, paints a grim picture of lead’s effects on public health: http://www.thelancet.com/journals/lanpub/article/PIIS2468-2667(18)30043-4/fulltext

Artificial Sweeteners: Increasing Obesity? 
Artificial sweeteners have been sold as a way to limit calorie intake, essentially cost-free. Increasingly, research is showing that is not the case. An example of such research comes from George Washington University, and it strongly suggests high consumption of artificial sweeteners can trigger metabolic changes, increasing the chances of developing obesity: https://www.smithsonianmag.com/science-nature/artificial-sweeteners-may-make-you-fat-180968552/

Exercise Prevents Immune System Decline 
While it is already clear that exercise helps prevent or mitigate many of the effects of aging, another study has shown the benefits of exercise extend to the immune system. Indeed, individuals in the study, some in their 70s and 80s, had T-cell production levels to rival 20-year-olds. The BBC reports: http://www.bbc.com/news/health-43308729