When you don't take regular breaks yourself, your brain will do it for you. You will simply not be productive no matter how hard you try.
When you spend all your time at meetings, when are you actually working? You should always schedule time not only to work on your main projects, but also to deal with unexpected events.
Food high in sugar, salt and fat takes away your energy instead of boosting it. You may also lack energy because you don't have enough physical activity. Movement helps reduce stress. When you feel tired, try sport rather than increasing your intake of caffeine. Also, you should sleep at least 8 hours a day.
Do you think that communication and meeting others is only a waste of time? Sometimes it can be true, but there is no better way to get motivated for work than to stop isolating yourself.
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Article source A Life of Productivity - a website of Chris Bailey from Ottawa, Canada