Later research on gardening found that it improved satisfaction with life and mood. Digging in the dirt really lifts your spirits. Digging awakens microbes in the soil. Inhaling these germs can stimulate serotonin production, which can make you feel relaxed and happy.
Growing your own food can also improve your emotional health and happiness. In a recent study of 370 home gardeners, Princeton researchers reported that participants who grew their own produce reported higher levels of well-being than those who grew flowers and ornamental plants. In addition, the researchers found that, of the 15 activities studied, only home gardening was associated with greater emotional benefits for women and people with low incomes compared to men and participants with middle or high income. Getting dirt under your nails while you dig in the ground can make you very happy.
Vaccines, a healthy bacteria that live in soil, can increase serotonin levels and reduce anxiety.