Seemingly small issues can cause big problems. Most people ignore blood while flossing their teeth just as easily as they ignore a churning stomach or constipation. But gum disease, known as periodontitis, allows bacteria to enter the bloodstream and spread throughout the body, increasing the risk of conditions ranging from heart disease to heart attacks. An unhealthy diet can also disrupt the gut microbiome. The result is not only digestive problems but also a weakened immune system and poorer mental health. Good oral hygiene and a balanced diet are therefore essential for long-term health and longevity. But can we also protect ourselves against acute infections? Norovirus is particularly contagious: Even a tiny amount of the virus can trigger severe vomiting and diarrhea. DW’s In Good Shape explains the most effective ways to prevent infection and stay healthy.