Around 38% of U.S. adults live alone (it was only 8% in the 1940s), and 20% off people have family members that live far away. So it isn't surprising that a research letter in JAMA reveals that around one-third of people say they are usually lonely — and almost as many are feeling isolated.

This can have profound mental and physical health repercussions, increasing the risk for heart disease and stroke, Type 2 diabetes, depression and anxiety, self-harm, dementia, and premature death.

Unfortunately, it can be hard to break through feelings of loneliness and isolation and become healthier and happier. It takes a plan — and a determination to find a purpose, build a posse, and take care of yourself.

Here are some of our most effective ideas for shattering your loneliness:

• Volunteer either in person, online, or on the phone to help promote a cause you care about. Check out volunteermatch.org for ideas.

• Sign up for classes (also virtual or in person). Googling "find classes to take" will give you lots of local choices.

• Join a yoga or tai chi class, or join a gym. You will meet people, improve your physical health (which gives you more energy to have adventures), and dispel stress.