Inclusion Criteria:

- 18-year-old or older

- Colorectal or lung cancer demonstrated by histology or cytology

- New diagnosis or new recurrence

- Expected survival more than 3 months

- No previous history of other cancer in the last 5 years

- No pregnancy or lactation

- Signed informed consent

Exclusion Criteria:

- Non-caucasian

- Major digestive malabsorption

- Major depression

- Artificial nutrition

- Height doses of steroids (>1 mg/kg hydrocortisone equivalent)

- Hyperthyroidism

- Other causes of malnutrition

- Expected survival less than 3 months

- Severely impaired walking

- Anticoagulants or antiplatelet therapy

- Disability or medical condition which might prevent the compliance to the protocol

- Any conditions which may prevent the compliance to the protocol

- Performance status ECOG > ou = 4

- Participation to other clinical studies