About Elena Gutiérrez
Elena Gutiérrez is a Registered Dietitian who reviews consumer nutrition technology for Clinical Nutrition Report, with a specialty in dietary-assessment validity — the question of whether a tracking method actually measures what it claims to measure.
Before joining the publication in October 2025, Elena practiced in an outpatient clinical setting and then spent two years as a research dietitian on a federally funded dietary-recall validation study, where she compared image-based portion estimation against weighed food records. That experience shapes her skeptical posture toward unvalidated accuracy claims.
At Clinical Nutrition Report, Elena authors hands-on evaluations of AI photo-estimation tools and serves as the editor of record for any article that cites app-level mean absolute percentage error (MAPE).
Credentials in detail
- MS, Clinical Nutrition — New York University Steinhardt
- BS, Nutritional Sciences — University of Arizona
- RD (Registered Dietitian) since 2018
Areas of focus
Elena’s reviews emphasize the distance between what an app advertises and what an independent benchmark can replicate. She is openly skeptical of “AI accuracy” claims that are not accompanied by a published method, a sample size, and a comparison group.
Conflicts of interest
Elena has no financial relationships with calorie-tracking app companies and holds no affiliate accounts. She received no compensation for any product evaluation published on this site.