Support Through Remote Observation and Nutrition Guidance Program (STRONG-PCS)

The study will be deemed feasible if ≥ 50% of eligible participants are enrolled.

The study will be deemed feasible if ≥ 70% of participants enrolled at baseline will be retained at 8 weeks.

The study will be deemed feasible if ≥ 70% of participants log food for greater than 80% of study days.

The study will be deemed acceptable if ≥ 70% of participants rate the overall intervention as satisfactory using a validated 4-item scale (score range 0-20, score >/= 12).

The study will be deemed usable if ≥ 60% of participants rate the mobile application as easy-to-use for logging dietary intake using a validated 10-item scale (score range from 0-100, score of >/=60).

Significant weight loss is defined as >5% and >10% of body weight at 30, 60, and 90 days after discharge. This will be calculated based on weight obtained during clinic visits.

Low BMI will be defined as <20kg/m² for individuals <70 years old and <22kg/m2 for individuals ≥70 years old. This will be calculated based on weight and height measurements from clinic visits.

Low muscle mass will be estimated by calculating skeletal muscle index (SMI) from routinely collected CT scans at baseline and 90 days after discharge (CT scans are conducted every 3 months). Low muscle mass will be defined as SMI ≤38.9 cm2 /m2 for females and SMI ≤55.4 cm2 /m2 for males.

Quality of Life will be measured using the Functional Assessment of Cancer Therapy - General (FACT-G) Questionnaire includes questions about the participant's physical, social, emotional and functional well being over the past 7 days. This questionnaire uses a 5 point Likert-type scale, 0=not at all, 4=very much. A higher score indicates a better quality of life.

Hospital readmissions will be measured using a self-reported survey item to determine whether the patient was admitted to the index hospital or another hospital after hospital discharge.

Nutritional status will be measured using the Patient-Generated Subjective Global Assessment (PG-SGA) Short Form (score range: 0-35) and categorized based on a prior validation study (0-1 well nourished, 2-8 at-risk, = 9 severely malnourished).