 Study Overview. The proposed study will take place at The Bridge homeless shelter in Dallas, TX. The study intervention will use a randomized controlled trial design, and an additional 50 transitional shelter residents will be recruited to participate in the proposed 8-week study 4-week intervention; 4-week post-intervention follow-up visit. Transitional Shelter residents stay in semi-private rooms for an average of 5 months while staff works to secure more permanent housing. Interested and eligible participants will be randomized to either 1 a 4-week shelter-based diet or physical activity intervention, or 2 standard care paid assessment only. Participants will be asked to complete weekly assessments of diet, physical activity, stress, readiness to change, and other relevant variables throughout the 4-week intervention period, in addition to a 4-week post-intervention follow-up. Participants will be compensated with gift cards for each of 6 visits. Participants assigned to the control group will receive tailored newsletters and pedometers with walking goals at the final follow-up visit. Laptop and tablet computers equipped with Questionnaire Development System software will be transported to the shelter for all intervention and assessment sessions. 