A handful of peanuts a day might keep stress at bay

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

Inclusion Criteria: * Males and females * 18-65 years old * BMI ≥ 18.5 kg/m2 and ≤ 39.9 kg/ m2 * Recruitment will be based on Perceived Stress Scale - 4 (PSS-4) score Exclusion Criteria: * Less than 18 and over 65 years old * Pregnant or lactating women * Adults who rely on prescription medication that may influence study variables, apart from birth control * BMI \< 18.5 kg/m2 and \> 39.9 kg/m2 * Smokers who currently use tobacco- or marijuana-containing products including e-cigarettes, vape pens, pod mods, tanks, and electronic nicotine delivery devices (ENDS) * Habitual consumption of nuts, nut butters, nut powders, nut side dishes, nut bars or other nut products * Known food allergies (milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, soybeans, sesame, corn) due to samples not prepared in a hypoallergenic environment * Currently living in close contact with individuals who have an allergy to peanuts, in order to avoid exposing these individuals to an allergen * Self-reported history of difficulties with blood drawing procedures including prior fainting or dizziness, or veins assessed as not suitable for four separate venipunctures by licensed phlebotomist * Diagnosed active chronic diseases for which the individual is currently taking daily medication, including but not limited to: * Diabetes mellitus, cardiovascular disease, cancer, gastrointestinal disorders, kidney disease, liver disease, bleeding disorders, asthma, autoimmune disorders, hypertension, osteoporosis * Recent minor surgery (within 4 weeks) or major surgery (within 16 weeks) * Known gallbladder disease or history of cholecystectomy * History of gastrointestinal surgery, including gastric bypass surgery or resection * Diagnosis of irritable bowel syndrome * Recent antibiotic therapy (within 4 weeks) * Recent hospitalization (within 4 weeks) * Current participation in another research study * Has HIV/AIDS, hepatitis, or another disease that affects the immune system * Gives regular blood donations and is unwilling to stop during the study * Blood Pressure ≥ 140 mmHg systolic or 90 mmHg diastolic * Current diagnoses of an eating disorder (ex. anorexia, bulimia, etc.) * High - very high triglyceride levels: ≥ 300 mg/dL * Adults who are unable to consent, individuals who are not yet adults (infants, children and teenagers), pregnant women and prisoners will be excluded from participation in the study * Participants who are unwilling to collect and transport urine, stool and saliva samples * Abnormal hemoglobin and/or hematocrit levels * Abnormal liver function (defined as liver enzymes that are \>200% of upper limit (ALT upper limit is 43 U/L or Aspartate transaminase (AST) upper limit is 54 U/L) * Unwillingness to discontinue probiotic, prebiotic, fiber, or other supplements (except RDA-level vitamin and mineral supplements) during the study * Unwilling to consume study foods * Alcohol consumption \> 20 g/day