Explorative Study on Addition of High-fiber Dried Chicory Root in Patients With an Intermediate to High-risk Cutaneous Melanoma.

Who May Qualify: - Age ≥18 years; - The participant understands the study and can provide written willing to sign a consent form; - The participant received surgical treatment of an intermediate to high-risk cutaneous melanoma (T2a/N1, T2b, T3a, T3b, T4a, T4b, N0 or N+, M0 stadium without evidence of disease); - Being able to read and speak Dutch; - Willing to come to the UMCG for practical reasons (visiting the study site); - Willing to continue their regular lifestyle patterns during the study. Who Should NOT Join This Trial: - Receiving concurrent adjuvant treatment, adjuvant treatment after the study period is allowed. - Having a medical history that may impact study outcomes, such as a diagnosis of diabetes mellitus type 2, heart disease, renal disease, autoimmune conditions (where your immune system attacks your own body); - Any clinically significant or unstable medical disorder involving the gut, including celiac disease, inflammatory bowel disease, short-bowel syndrome or acute/chronic pancreatitis; - Having an ileostomy or colostomy, as this greatly impacts bowel function and gut microbial composition; - Use of antibiotics in the 3 months prior participation in the study; - Use of prednisolone or other immunosuppressive medication; - Use of tube feeding or sib-feeding; - Being pregnant or lactating; - Participation in another interventional study at the same time; - Unable or unwilling to comply to study rules. Always talk to your doctor about whether this trial is right for you.