The mobile phone Food Record (mpFR) is a novel diet assessment tool (Six, 2010; Zhu 2009). Zepeda (2008) suggested that use of image‐based food records leads to reduced food intake. However, no quantitative analysis comparing self‐reported energy to expected energy intake (EEI) was reported. Our objective was to investigate the influence of mpFR use on EEI for meals and 24‐hr dietary intake. Distribution of energy intake (breakfast 16%, lunch 27%, dinner 33%, snacks 24%) was derived from results among 8th graders (Dwyer, 2001) and used to determine EEI as a percent of estimated energy requirement (EER). In a controlled setting, 26 boys and 51 girls aged 11–18 y used the mpFR to record meals eaten to satiation. Adolescents ate breakfast (n=70), lunch (n=78), and dinner and snacks (n=15). There was no significant difference between the EER and known energy consumed over 24‐hr (n=15, p = 0.352). Boys consumed significantly less energy from snacks than expected (mean difference 324 kcal, SE 111, p = 0.014). Girls consumed significantly more energy at dinner than expected (mean difference 196 kcal, SE 43, p = 0.044). Those with a BMI for age in the 85–95th percentile ate significantly less energy at lunch than expected (p = 0.047, mean difference 88 kcal). These results suggest that mpFR use does not mitigate behavior change in adolescents. The mpFR holds promise to accurately assess daily energy intake in adolescents.