Table 1.

Eligibility criteria based on PICOS.

PICOS	Inclusion Criteria
Population	Patients admitted to hospital with symptoms of COVID-19 infection, pneumonia, acute respiratory distress disorder, respiratory failure (ICU or acute) and then step-down or discharged OR Patients discharged from hospital with a confirmed diagnosis of COVID-19 infection, pneumonia, acute respiratory distress disorder or respiratory failure OR Patients in the community with a confirmed diagnosis of Covid-19 infection, pneumonia, acute respiratory distress disorder or respiratory failure Adults (18 years or more).
Intervention	Nutritional support to optimise dietary intake e.g. via artificial nutritional support (tube feeding or parenteral nutrition), oral nutritional supplements, dietary counselling, (nutritional), nutritional rehabilitation (not micronutrient or fatty acid or amino acid supplementation)
Control or Comparison	Usual care
Outcomes	Mortality, length of hospital stay, readmissions, quality of life, activities of daily living, nutritional status, weight change, handgrip strength, dietary intake, return to baseline functional status, reversal of COVID-19 associated symptoms e.g. poor appetite, loss of senses of smell or taste.
Type of Study	RCTs, cohort studies, cross sectional studies, systematic reviews, guidelines and pathways, audits and service evaluations, protocols