What percentage of the immune system does Dr. Jeffrey Bland say is patterned by diet?

Mona SharmaCelebrity nutritionist and wellness advocate

Your Diagnosis Isn’t the End — It’s a Message | Dr. Jeffrey Bland on Rooted in Wellness

25 Oct 2025 · 1 min

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Dr. Jeffrey Bland says 40 to 70 percent of immune function comes from diet, making nutrition the biggest factor in immune dysfunction. Environment and past infections shape the rest. He describes long COVID as a lingering effect of prior immune stress.

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40 to 70%

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What are the biggest contributors, you know, from your lens have, have really crept in that are dysfunctioning us, I think.
First of all, we know that 40 to 70% of our immune system is patterned, meaning how it behaves is tied to what we eat or what we've been exposed to as we eat. So that's a pretty big one. Number two is the environment in which we live as it relates to our viruses and bacteria and things that we've gotten as infectious illnesses over the course of our life. They also influence our immune system. And we know that like long Covid people are experiencing now as a consequence of infection with SARS. CoV2 is a resonant effect.