known_biases: A single unblinded diet RCT of 140 overweight adults with prediabetes/T2D run by one Sydney investigator team (Boden Institute); both the 3-month phase (Fuller 2015) and the 12-month follow-up (Fuller 2018) rest on this one cohort, so they share single-site/single-team execution, modest power, an open-label dietary-advice design with a background-diet match that may blunt any egg effect, and whatever selection or adherence quirks the one trial carries.