Table 1.

The population, interventions, comparators, outcomes and study designs (PICOS) scheme used for assessing eligibility.

Criteria	Description
Participants	Men and women diagnosed with early-onset colorectal cancer or colorectal adenoma before age 55
Intervention/exposure	Plant-based dietary approaches; Prudent diet; Vegetarian diet; healthy dietary components
Comparison	Western diet; High fat diet; unhealthy dietary components
Outcomes	Colorectal cancer and adenomas histologically confirmed by a doctor
Study design	Case-control and cohort studies