AM. Preston (2025). Examination of three ketogenic diet plans: Congruency with the Healthy Eating Index (HEI) and consistency of the day-to-day HEI scores for a period of 1 week. Nutrition and health, 31(4), 1669-1674. https://doi.org/10.1177/02601060251314573

PubMed 40734566

[Abstract]
Background: The consistency of the day-to-day scores of the Healthy Eating Index (HEI) for commercial ketogenic meal plans and if these scores are compliant with the Dietary Guidelines for Healthy Americans (DGA) have not yet been evaluated. Aim: To make this determination. Methods: We have selected three commercial ketogenic meal plans: MP1, MP2 and MP3. Using scores calculated for the HEI during the period of 1 week each, we are able to determine day-to-day compliance of HEI scores to the DGA as well as consistency of HEI values throughout the week. Results: The 7-day mean score of HEI for MP1 was 54.1 ± 2.6 and classified as "Some changes needed"; however, MP1 had a relatively consistent pattern of HEI scores. MP2 had a score of 44.3 ± 7.8 and classified as "Big changes needed" as well as an inconsistent pattern of HEI values. MP3 had a score of 53.3 ± 10.3, also classified as "Some changes needed" and an inconsistent pattern of HEI values. Conclusions: Commercial meal plans based on ketogenic metabolism will have HEI scores from a minimum in the 30s to a maximum, not exceeding 70. Depending upon the adherence of the manufacturer's recipes to the DGA, the day-to-day HEI scores will vary accordingly. These results suggest that if some or major changes are not taken, continuation would not be advisable for long-term use.