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Do not try to choose your thoughts but control them as they come. Make your thoughts and mental health a priority. Know what events trigger difficult thoughts. Meditate. Reframe your thoughts in a positive or non-intrusive light. Recognize that there are many things you cannot control.
The human brain is an incredible organ capable of making imaginative leaps, recalling memories, and finding insights at a moment's notice, and you will never control every thought. Try to watch your thoughts come and go without any attachment rather than repressing those you don't want to have. Thinking about ignoring something, paradoxically, never works. Every time you think about not thinking about something, you are of course thinking about it! Take care of your brain by getting 7-8 hours of sleep a night, managing your stress levels, and maintaining a positive outlook on life. Eating healthy foods and exercising regularly promotes good mental health as well as physical. While you should not avoid all of your problems, be aware of the things that move your thoughts in a negative direction and prepare yourself when they arise. Structure your day so that you end on a positive trigger, like creative work, family time, or a good book, allowing you to spend downtime thinking about the things you love.   Take a few moments each day to pause and take stock of your life. Be aware of your thoughts during "trigger moments", again forgoing judgment or self-critique. Throughout the ages, meditation has been a vital tool helping people relax and take control of their thoughts. Find time to meditate daily, even if only for 5-10 minutes, especially the days when your thoughts are the most difficult to control. Meditation has even been shown to lead to a healthy heart and body. Reframing your thoughts puts them in context of the world around you, allowing you to better understand them. Consider other perspectives regarding your situation, as well as others' behavior. Work to develop empathy, as this will help you avoid taking things too personally. For example: When someone you love hasn't called in a while, it is likely because they are busy, or stressed, not sick or in danger. Don't obsess about things that you ultimately cannot control -- other people, the weather, the news -- and instead focus on yourself. When you think about things outside of your control, remind yourself that the only person you can control is yourself, and work on that. This does not mean you shouldn't try to impact the world around you -- rather that you will always have the biggest impact on your own thoughts.