Thank you for your comment, income is most certainly important and we have now emphasised its importance in lines 419-428, 503-506, 533-537 and 550-555. We also have mentioned that parental education is being used as a proxy for SES lines 257-258 but we cannot infer anything about income as this was not measured, only parental education, not overall SES.
Focusing only on the global KQ-10 scores is hiding the subdomain differences to diet.