Breakfast shake study reveals how fats may tweak your immune system

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

Inclusion Criteria: * Apparently healthy man or woman * Age 40-70y at the time of screening * BMI of 22-27 kg/m2 * Having a Hb value above 8.4 (men) or 7.4 (women) mmol/L * Having veins suitable for blood sampling via a catheter cannula (judged by study nurse/ medical doctor) * Willing to have dairy-based breakfast every day * Having a mobile phone suitable for installing the research app * Signed informed consent and able to adhere to the protocol Exclusion Criteria: * A history of cardiovascular diseases, such as a stroke or heart disease; * Having an eating disorder; * Having diabetes (type I or type II); * Having used antibiotics in the past 3 months; * Using diabetes medication; * Using medications that may affect the study results (as assessed by the study physician); * Suffering from stomach or intestinal problems, such as Crohn's disease, ulcerative colitis, irritable bowel syndrome, or having undergone major digestive system surgery; * Having known food allergies or intolerances to foods used in the study (e.g., cow's milk); * Having an Hb level of less than 8.5 mmol/L (for men) or less than 7.5 mmol/L (for women) - to be tested during the eligibility assessment; * Being allergic or intolerant to medical skin patches; * Suffering from chronic or acute inflammatory diseases, such as rheumatoid arthritis or psoriatic arthritis; * Having an autoimmune disease; * Having thyroid problems; * Having recently donated blood (within 2 months before the eligibility assessment) or planning to donate blood during the study period; * Having recently participated in another medical-scientific study (within 2 months before the eligibility assessment); * Suffering from severe kidney or liver problems or a chronic kidney or liver disease; * Following a specific diet that may affect the results or is unsuitable for the study, such as a vegan diet; * Using tobacco/drugs or smoking (including snus and/or vaping); * Drinking more than 14 (for women) or 21 (for men) alcoholic drinks per week; * Being pregnant, planning to become pregnant, or breastfeeding; * Gained or lost more than 5 kg body weight in the past 3 months; * Intention to lose or gain more than 5 kg during the study period; * Intention to change exercise intensity during the study period; * Not having a mobile phone suitable for using a research application; * Having another serious medical condition that may interfere with participation, thus being deemed unsuitable for participation in the study as assessed by the study physician or principal investigator (e.g., displaying inappropriate behavior); * Inability to comply with the study diet * Inability to understand study information/communicate with staff; * Being employed or doing an internship at the Department of Human Nutrition and Health of Wageningen University or FrieslandCampina.