Comment by forward1

Already covered by my previous comment: the people in this study simply did not eat enough food.

> the recommended energy intake was not met on any of the days by more than half of the participants (55%) (Table 3), and only 10% met the recommended energy intake on all three days.

Fig. 1 even directly demonstrates my point: https://bmcnutr.biomedcentral.com/articles/10.1186/s40795-02...