Sadness will be assessed by the 7-item National Institutes of Health (NIH) Toolbox Sadness Parent Report Fixed Form. Response choices for the 3-Likert scale include: never or not true, sometimes or somewhat true, and often or very true. A total raw score was calculated and then transformed to the uncorrected T-scores (M=50, SD=10). A higher T-score indicates a higher level of sadness reported by parents/caregivers.

Fear will be assessed by the 6-item, 3-Likert (never or not true, sometimes or somewhat true, often or very true) NIH Toolbox Fear-Over Anxious Parent Report Fixed Form. A total raw score was calculated and then transformed to the uncorrected T-scores (M=50, SD=10). A high T-score indicates a higher level of fear.

Anger will be assessed using the 9-item, 3-Likert (never or not true, sometimes or somewhat true, often or very true) NIH Toolbox Anger Parent Report Fixed Form. A total raw score was calculated and transformed to the uncorrected T-scores (M=50, SD=10). A higher T-score indicates a higher level of child anger.

Positive affect will be assessed by the 9-item NIH Toolbox Positive Affect Parent Report Fixed Form. Each question has five response choices: not at all, a little bit, somewhat, quite a bit, and very much. A total raw score was calculated and then transformed to the uncorrected T-scores (M=50, SD=10). A higher T-score indicates a higher level of positive affect.

Height will be measured to the nearest 0.1cm using the Shorr board, and weight will be measured to the nearest 0.1kg using the Seca 874 scale or the portable InBody 270 body composition analyzer. The online SAS program for Centers for Disease Control and Prevention Growth Charts was applied to calculate preschoolers' BMI for age and sex.

Percent body fat will be measured to the nearest 0.1% using the portable InBody 270 body composition analyzer (FDA cleared medical device). When measuring % body fat, each participant's study ID, biological sex, age, and height will be entered into the scale. After the setup, each participant will be instructed to step on the scale surface and align feet with the food electrodes. When prompted, each participant will grab the hand electrodes by placing their thumbs on the thumb electrodes and wrapping their fingers around the bottom electrodes.

Preschoolers' chronic stress will be assessed by hair cortisol concentration level. A proximal 3-cm segment hair sample, weighing approximately 20 mg, will be cut from 2-3 locations at the posterior vertex of each preschooler's head with a stainless-steel styling shear. Hair samples (labeled at the root ends furthest away from the head) will be stored in an aluminum foil pouch at room temperature. The hair samples will be analyzed by the Child Study Center lab at the Yale University. Cortisol in pg/mg will be extracted from the powdered hair by incubation with methanol for 18-24 hours.

Actigraph (wGT3X-BT; 7-day period) worn on hip by both preschoolers and caregivers will be used to measure physical activity. Before distributing the ActiGraph to dyads for wearing, investigators will use the ActiLife software to initialize each ActiGraph and set to begin data collection at 5 AM on the day after dyads receive the ActiGraph from data collectors. When distributing the ActiGraph to dyads, the "superhero with a magic belt" story will be shared with preschoolers to encourage them to wear the ActiGraph for 7 consecutive days, and written wear instructions will be provided to caregivers: right hip (attached to belt) from time getting out of bed in AM to going to sleep at night for 7 consecutive days (not worn bathing/swimming).

Fruit/vegetable intake will be assessed by the skin carotenoid levels via Veggie Meter® as well as a 2-question survey. Each participant's non-dominant index finger will be used, and the average of three scans with a range of 0-850 will be recorded as the final score. A high Veggie Meter score indicates a higher level of fruit/vegetable intake. For the 2-question survey, a sum score with a range of 0-10 will be calculated, with a higher score indicating a higher level of fruit/vegetable intake.

Systolic and diastolic blood pressure will be assessed by the SunTech CT40 device. Investigators will follow the procedures in the Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure: 1) Caffeine, exercise, and smoking will be avoided for at least 30 minutes before measurement; 2) The caregiver will be seated quietly for at least 5 minutes in a chair, with feet on the floor and arms supported at heart level; 3) An appropriate sized cuff (cuff bladder encircling at least 80% of the arm) will be used on the left arm unless having a surgery or injury; 4) Two measurements will be taken at 1 minute interval and averaged for recording; and 5) The caregiver will receive their blood pressure reading in writing as well as the American Heart Association Blood Pressure Fact Sheet demonstrating the blood pressure categories, strategies for controlling blood pressure, and blood pressure resources.

Caregiver-preschooler relationship will be measured by the 15-item Child-Parent Relationship Scale - Short Form (CPRS-SF), which is a 5-point Likert scale with 2 subscales: conflict and closeness. Sum scores (range for conflict subscale is 8-40, range for closeness subscale is 8-35) will be calculated, with a higher sum score indicating a higher level of relationship.

Caregiver mindfulness will be assessed by the 15-item Mindful Attention Awareness Scale, which is a 6-point Likert scale to assess trait mindfulness. A mean score (min-max: 1-6) will be calculated, with a higher mean score indicating a higher level of mindfulness.

Parental coping strategies (problem-focused, emotion-focused, and avoidant coping) will be measured by the 28-item Coping Orientation to Problems Experienced Inventory (Brief-COPE). It is a 4-point Likert scale. Mean scores (min-max: 1-4) will be calculated for each coping category, with a higher mean score indicating a higher level of coping.

The U.S. Household Food Security Survey Module will be used to assess household, parent, and preschooler food insecurity status. Raw sum score will be calculated for each outcome (household food insecurity raw score range is 0-18, raw score range for adult food insecurity is 0-10, raw score range for child food insecurity is 0-8) and then divided into food insecure and food secure categories. A higher raw score indicates a higher level of food insecurity.

Home environment will be assessed by the 20-item Family Nutrition and Physical Activity Screening Tool.t has two subscales: eating and physical activity home environment. A sum score, with a range of 10-80 will be calculated, with a higher sum score indicating a healthier home environment.

Caregivers' anxiety and depression will be measured by the Patient Health Questionnaire (PHQ)-4. The PHQ-4 is a questionnaire answered on a four point Likert-type scale. It has the two-item measure for depression (PHQ-2) and a two-item measure for anxiety (Generalized Anxiety Disorder, GAD-2). The total PHQ-4 score (range 0-12) will be calculated, with a higher score indicating a higher level of anxiety and depression.

Caregivers' stress will be assessed by the 10-item Perceived Stress Scale. It is a 5-point Likert scale, with response choices of never to very often. A sum score (range: 0-40) will be calculated, with a higher sum score indicating a higher level of perceived stress.