Several studies have made links between diet and tear film health. Malnutrition leads to unhealthy and unstable tear film. Vitamin A and protein deficiencies are very detrimental to the health of tear film. Hyperlipidemia (high cholesterol and high triglycerides), and diets low in Omega-3 fatty acids, are risk factors for poor tear film.
Reference
Diet, nutraceuticals and the tear film
Jalbert I.
Experimental Eye Research
2013 Dec;117:138-46. doi: 10.1016/j.exer.2013.08.016. Epub 2013 Sep 3.
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