This is pretty much unavoidable (there is no way to casually duck under your desk before a colleague sneezes, at least not without looking like a germaphobe), but there are things you can do to keep yourself healthier. You already know the obvious--eat healthy meals, get plenty of sleep and avoid touching your face after someone sneezes on your hands, but you can also keep yourself healthier by focusing on stress management.
Stress management is an important component of health and immunity for two main reasons. First, stress can impact immunity, which leaves us vulnerable to a multitude of issues, not the least of which is the common cold and flu. Managing stress effectively can allow us to remain healthier because our immunity is stronger this way. Another way in which stress management factors into overall health is that many of the most effective stress relievers also have an impact on general health--when we exercise, eat well, meditate, and in other ways take care of our bodies, we relieve stress while we maximize our wellness. Conversely, if we are practicing these habits for wellness, stress relief becomes a happy by-product. This article on stress and wellness explains the role stress plays in your overall health, and provides solutions on staying healthy.
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I see you’re having issues with stress. This will help – bit.ly/SvgsRR