Please select the eligibility criteria that correspond to the clinical trial below.
Title: N/A
Brief Summary: The aim of the current study is to evaluate the effects of diets with three levels of dietary fat on weight change and related cardiometabolic risk factors in a 6-month randomized controlled-feeding trial.


Options:
A: Inclusion criteria:

* Students in Zhejiang University or working stuff in the Chinese PLA General Hospital
* 18 ≤ age ≤ 35
* Body Mass Index \< 28\*
* Are willing to eat all of the study foods even when full
* Are willing to eat only foods provided
* Are willing to avoid strenuous activity during the 6-mo intervention Exclusion criteria：
* Systolic blood pressure ≥ 140 mmHg or diastolic blood pressure ≥ 90 mmHg
* Total cholesterol ≥ 239 mg/dL
* Low-density lipoprotein cholesterol ≥ 159 mg/dL
* Triglycerides ≥ 199 mg/dL
* Blood glucose ≥ 110 mg/dL
* Change in body weight exceeding ± 10% during the prior year
* Energy intake is too low or too high
* Unwillingness or special requirement for diet that could not be modified
* Poor adherence during the recruiting meeting or unsatisfactory completion of keeping food diary or filling questionnaire at any time before randomization
* Eating disorder or any psychosocial or scheduling factors that could impede study outcomes
* Have a history of diagnosed CVD, diabetes, cancer or inflammatory diseases
* Have a history of a mental illness
* Have diagnosed endocrine, pulmonary or hematological disease
* Have diagnosed bowel disease or malabsorption that would prevent the participants from complying with the dietary restrictions of the feeding trial
* Renal or liver insufficiency
* Other chronic disease thought to interfere with the effect of the diet or with participation or adherence
* Current use of supplements or anti-inflammation medications or medications affecting glucose, lipid metabolism and blood pressure
* Smoking or alcoholic beverage intake \>1 times per week
* Current or planned pregnancy prior to end of study, or breast-feeding
* Irregular menstrual cycles
* Have birth control medication
B: Inclusion Criteria.

* Healthy men.
* BMI 30-40.
* Fasting blood glucose \< 7 mM.
* Stable body weight last 2 months.

Exclusion Criteria.

* High intake of alcohol.
* Medication affecting glucose or lipid metabolism.
* Allergy towards important food items in the diet.
* Inflammatory bowel disease.
* Surgery or use of antibiotics last 2 months.
C: Inclusion Criteria:

* healthy men and women aged 30 to 65 years who has one or more self-assessed ischemic heart disease risk factors at screening: physical inactivity, overweight or obese (BMI ≥ 25/m2 ), waist circumference (≥ 80 cm for women, ≥ 94 cm for men). In addition, the participants should have the motivation and willingness to be randomized to any of the three groups, and to do their best to follow the given protocol .

Exclusion Criteria:

* no internet access or no access to a computer, smoking, pregnancy, or breast-feeding or planning to become pregnant within the next 12 months, a history of cardiovascular disease, type 2 diabetes, chronic disease / disorders that may affect the results of the study, substance abuse within the past 12 months, regular alcohol consumption \> 21 units / week for men or \> 14 units/ week for women, allergy or intolerance to food groups in the dietary guidelines, supplements with mega doses of nutrients that can have potential impact on ischemic heart disease risk markers (eg . fish oils).
D: Inclusion Criteria:

* 63 to 79 years old
* healthy men and women
* able to attend clinic at a study sites

Exclusion Criteria:

* illiteracy or inability to understand the protocol
* unable to undergo neurophysiological tests
* morbid obesity (BMI greater than or equal to ≥ 40 kg/m2)
* uncontrolled diabetes (HbA1c\>85)
* uncontrolled hypertension
* prior cerebrovascular accident
* any relevant psychiatric illness, including major depression
* advanced cognitive deterioration, dementia
* other neurodegenerative diseases (i.e. Parkinson's disease)
* any chronic illness expected to shorten survival (heart, liver, cancer, etc)
* bereavement in the first year of loss
* bad dentures unless fixable dental prostheses are used
* allergy to walnuts
* customary us of fish oil or flaxseed oil supplements
* eye related exclusion criteria

Answer: A