Trial progression criterion
| Feasible (green) | Feasible with modification of the protocol (amber) | Not feasible (red) | |
| Recruitment | ≥4 patients/month | >2 patients/month | ≤2 patients/month |
| Uptake to the feasibility study | ≥15% | 10%–15% | <10% |
| Retention to the feasibility study | >70% | 50%–70% | <50% |
| Adherence to the ILED intervention | >50% of the low-energy days completed (2 /week between weeks 24-30 and delivery) | 30%–50% of the low-energy days completed (2 /week between weeks 24-30 and delivery) | <30% of the low-energy days completed (2 /week between weeks 24-30 and delivery) |
ILED, intermittent low-energy diets.