It has been known for many years that animals can have positive effects on the health of humans. Studies have shown that animals can increase longevity after heart attacks, lower cholesterol, and even predict seizures in people.

In an unusual study, the effect of aquariums on the nutritional intake of patients with Alzheimer's disease was examined. Those conducting the research found that after introducing aquariums into the dining room of a facility caring for 62 patients, there was a significant increase in the amount of food the patients consumed. Weight also increased significantly over a 16-week period. As a result of eating more, the patients required less nutritional supplementation, which also had the benefit of reducing health care costs. In addition to the nutritional benefits, there was also a significant decrease in physically aggressive behaviors among the patients.

Other studies have found that people who watch fish in aquariums have a notable decrease in blood pressure. There was also a trend for aquarium watchers to have a decreased pulse rate and decreased muscle tension. In yet another study, watching fish in an aquarium was found to be as effective as hypnosis in reducing anxiety in patients awaiting dental surgery.

These studies all show that in addition to both the learning and aesthetic benefits of aquariums, people who care for and watch fish can reap health benefits, as well.