Mouth feel may explain why cancer patients stop eating

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: All subjects: * Person between 18 and 65 years * Person having given free, informed, express written consent * Person affiliated to a French social security system * Person with a body mass superior to 18 kg/m². * Person able to come once to the Institut Paul Bocuse Patients with head and neck cancer with chemotherapy: \- Patient diagnosed with squamous cell head and neck cancer with the following treatment regimen: Surgery + radiochemotherapy or radiochemotherapy alone Patients with head and neck cancer without chemotherapy: \- Patient diagnosed with squamous cell head and neck cancer with the following treatment regimen: Surgery + radiation therapy or radiation therapy alone Healthy volunteers : * Volunteer who is +/- 5 years of age relative to the patient to whom they are matched. * Volunteer of the same sex as the patient to whom they are matched * Volunteer with the same smoking status as the patient to whom they are matched * Volunteer who has not had cancer within 5 years at the time of inclusion * Volunteer with no current treatment that may affect taste and smell perception Exclusion Criteria: All subjects: * Person with a known food allergy/intolerance (lactose or milk protein) or unable to consume dairy or solid products (e.g., chocolate milk pudding, chocolate jelly) * Person with a known allergy to chili (or capsaicin) * Person with diagnosed total ageusia * Person with diagnosed total anosmia * Person who has used artificial feeding within 2 months prior to inclusion. * Person who has lost more than 10% of baseline weight in the 2 months prior to inclusion * Person deprived of liberty or under guardianship or trusteeship. * Pregnant or breastfeeding woman * Person deprived of liberty by a judicial or administrative decision * Person under guardianship or protection of vulnerable adults * Person with trismus (reduced jaw opening or limited jaw range of motion) * A person who is unable to extend his or her tongue * Person who has had surgery on the mobile tongue and/or base of the tongue * Person unable to swallow soft foods * Person who has had or is suspected of having had Corona Virus Disease (COVID)-19 within the last 6 months. Patients with head and neck cancer: * Patient receiving immunotherapy * Patient treated with surgery only.