Body Composition Assessment and Smart-phone Based Counselling on Healthy Eating and Weight Management

Inclusion Criteria: * Able to understand Cantonese and read Chinese; * Self-reported vegetable and fruit consumption is less than 5 servings per day (one serving means 125 mL (½ cup) fresh, frozen or canned fruits or vegetables; or 250 mL (1 cup) raw leafy veggies or salad; or 125 mL (½ cup) 100% juice; or 1 fruit; * Reachable by smart-phone and familiar with the use of smart-phone; * Would not move from the local area during the study period. Exclusion Criteria: * Self-reported history of cardiovascular and pulmonary diseases, neurological disorder, musculo-skeletal disorder, osteoarthritis, and eating disorder; * Receiving medically prescribed diet or physical activity intervention; * For women, currently pregnant; * Have been taking any medications or long-term supplement such as herbs; * Cannot provide written informed consent.