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In earlier posts we explored the relationship between vitamin D level and Omega-3 Index and the occurrence of colds and the flu separately. Using the data you provided for the GrassrootsHealth study, we’ll explore whether vitamin D and omega-3 have a combined effect on colds and the flu.

For vitamin D alone, the percent of participants who experienced the flu in the prior 6 months was 32% lower for those with a vitamin D level at or above 40 ng/ml (100 nmol/L) compared to those with a level below 40 ng/ml (P<0.00001). For colds, it was 11% lower (P=0.00001).

For omega-3 alone, the percent of participants who experienced the flu in the prior 6 months was 38% lower for those with an Omega-3 Index at or above 8% compared to those with an Index below 8% (P=0.09). For colds, it was also 11% lower (P=0.26).

For vitamin D and omega-3 combined, the percent of participants who experienced the flu in the prior 6 months was 52% lower for those with a vitamin D level at or above 40 ng/ml who also had an Omega-3 Index at or above 8% compared to those with a vitamin D level below 40 ng/ml who had an Omega-3 Index less than 8% (P=0.02). For colds, it was 25% lower (P=0.02).

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This preliminary analysis suggests that the combined effect of both maintaining a vitamin D status of at least 40 ng/ml and an Omega-3 Index of at least 8% could provide greater risk reduction for colds and the flu than relying on either nutrient alone. Further analysis is needed to assess this association by adjusting for other biometric and lifestyle risk factors. These analyses of individual and combined nutrient effects from GrassrootsHealth are possible because YOU provide us with data on multiple nutrients and health outcomes.

Test to know your status of these essential nutrients to help protect you from the cold and flu

Make sure you know your Omega-3 Index (target of at least 8%) and your vitamin D level (target of 40-60 ng/ml or 100-150 nmol/L), and are taking daily steps to keep both within range. Find out your levels today! Log on to the test selection page (click the link below) to get your tests and see for yourself if your levels can be improved.

Make sure you track your results before and after, about every 6 months!

Click Here to Access the Test Page

How can I track my nutrient intake and levels over time?

To help you track your supplement use and nutrient levels, GrassrootsHealth has created an online tracking system called myData-myAnswers. For each specific supplement, you can track what days you take it, how much, and many other details. This will help you know your true supplemental intake and what patterns of use work for you to reach and maintain optimum nutrient levels. Check it out today!