Randomized participants will be coached to practice a breathing technique that focuses attention on the sensations in the heart area, slowing and deepening the breath, and activating through memory or imagery a positive emotion. This practice is used along with a feedback device that provides information on achievement of the heart rate variability target, "coherence" that represents a neurocardiac state associated with vagal tone, or balance.

Measured using tape measure to record inches while participant is standing against a wall.

Digital scales measurement is used to record weight in pounds.

Questionnaire about the amount of stress participants are experiencing daily use includes 10 items with a 0-4 response format. Total scores range from 0-40 with higher scores indicating more perceived stress.

Questionnaire about the sleeping habits of participants includes 7 items with response format of 0-4. Total scores range from 0 to 28 with higher scores indicating more severe insomnia: 0-7 = No clinically significant insomnia 8-14 = Subthreshold insomnia 15-21 = Clinical insomnia (moderate severity) 22-28 = Clinical insomnia (severe)

Questionnaire includes a 6-item subscale rating level of depression. Participants respond to a single word item by marking a response scale of 0 to 4, with totals ranging from 0-24. Higher scores indicate higher experience of depression.

Questionnaire includes a 6-item subscale rating level of anxiety. Participants respond to a single word item by marking a response scale of 0 to 4, with totals ranging from 0-24. Higher scores indicate higher experience of Anxiety.

Questionnaire about the emotional regulation of the participants includes 10 items describing ways of regulating emotion with response options from 1-7. Total scores range from 10-70 with higher scores indicating more emotion regulation patterns.

Questionnaire about the typical eating habits of the participants related to various states of mind or emotions; includes 21 items scored 1-4; total scores range from 21 to 84 with higher scores indicating more controlled/managed and less emotional eating behaviors.

The Awareness subscale of the Mindful Eating Questionnaire including 7 items about degree of attention while eating; response format 1-4 (with total score range 7-28) shows higher scores representing more awareness/mindfulness in eating behavior.

The Letter-number sequencing, and forward backward digit span tests of the Weschler Adult Intelligence Scale (WAIS) III will be administered to study participants to examine cognitive performance. Sets of letters and sets of numbers are read to the participant iteratively; after each set is read, the participant is to repeat back according to instructions to repeat or to repeat in backward order. The first sets are smaller numbers of presented items, increasing with each set of presentations, and are continued until the participant fails a full set. higher scores indicate better cognitive performance. Scores are based on a score of 1 per presented item completed correctly until failure, range 0-51(30 for digits forward/backward and 21 for letter number sequencing).