The goal of this observational study is to build on our previous work to further characterise the phenotype of superlean individuals (BMI \< 18.5) when compared to normal BMI people (BMI 21.5 to 25). This will include characterising the body composition, food intake behaviour, circulating hormone levels, genetics and characteristics of the gut microbiota. The investigators expect to recruit up to 200 healthy superlean and control volunteers respectively,
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Weight
Timeframe: Through study completion, an average of 2 years, will be measured on arrival.
Height
Timeframe: Through study completion, an average of 2 years, will be measured on arrival.
Waist circumferences
Timeframe: Through study completion, an average of 2 years, will be measured on arrival.
Hip circumferences
Timeframe: Through study completion, an average of 2 years, will be measured on arrival.
Bone mineral density
Timeframe: Through study completion, an average of 2 years, will be measured on arrival.
Fat mass
Timeframe: Through study completion, an average of 2 years, will be measured on arrival.
Fat free mass
Timeframe: Through study completion, an average of 2 years, will be measured on arrival.
Blood pressure
Timeframe: Through study completion, an average of 2 years, will be measured on arrival.
Glucose
Timeframe: Through study completion, an average of 2 years, will be recorded for a consecutive of 7 days.
Body temperature
Timeframe: Through study completion, an average of 2 years, will be measured before and after feeding.
Resting energy expenditure
Timeframe: Through study completion, an average of 2 years, will be measured on arrival.
Physical activity
Timeframe: Through study completion, an average of 2 years, will be recorded for a consecutive of 7 days.
Body shape
Timeframe: Through study completion, an average of 2 years, will be measured on arrival.
Energy intake
Timeframe: Through study completion, an average of 2 years, will be measured on arrival.
Circulating hormones
Timeframe: Through study completion, an average of 2 years, will be measured after standard intervention meal.
Microbiome
Timeframe: Through study completion, an average of 2 years, will be measured after samples collected.
Metabolites
Timeframe: Through study completion, an average of 2 years, will be measured after samples collected.
Genetics
Timeframe: Through study completion, an average of 2 years, will be measured after samples collected.