Yes, there is. Of course, as much as we have diversity in our genes, we also have diversity in our gut capacity to digest and process food. This is of course the filter that will influence or modify the impact of a food on your health.
At the end of the day, what we see from the literature is that if you consume a Mediterranean diet.... And that takes away the effect of the gut completely. If you consume that diet, irrespective of the genes you have in your gut, or the bacteria, you're going to have some benefits. There is a filter, but it's just a filter, and what we're seeing is the end product of that filter. At the end of the day, it's the whole diet that counts. There is an interaction between foods and how we process foods in the gut, but it's the whole diet that will count. This is just a filter.