grass. Any of a large family (Gramineae or Poaceae) of monocotyledonous plants having narrow leaves, hollow stems, and clusters of very small, usually wind-pollinated flowers. Grasses include many varieties of plants grown for food, fodder, and ground cover. Wheat, maize, sugar cane, and bamboo are grasses.If you're indoors too much, you might become vitamin D deficient, and vitamin D is a key nutrient in helping to build a strong immune system. This can increase your chances of catching infections, and make it more difficult to fight off disease. Taking a break from social media allows individuals to reduce stress, improve their self-esteem, and foster a healthier relationship with technology. Mental health includes our emotional, psychological, and social well-being. It affects how we think, feel, and act. It also helps determine how we handle stress, relate to others, and make healthy choices. Mental health is important at every stage of life, from childhood and adolescence through adulthood. Being out in nature often may lead to lower rates of heart disease. The great outdoors can also help you increase your vitamin D level.