Heavier people get sicker and are also more likely to spread the disease, researchers said, and that has the potential to amplify a flu outbreak. Public health news is on including family in holiday workouts, air pollution’s impact on the brain, cancer treatments for the elderly, California’s Healthy Blue Zone, dangers from probiotic bacteria, skin-lightening products, a mysterious lung ailment, push back against vets’ service dogs, and dengue fevers risks for travelers.