Gunnerud U, Holst JJ, Östman E, Björck I The glycemic, insulinemic and plasma amino acid responses to equi-carbohydrate milk meals, a pilot- study of bovine and human milk. Nutr J. 2012 Oct 12;11:83. doi: 10.1186/1475-2891-11-83.
Lynch CJ, Adams SH Branched-chain amino acids in metabolic signalling and insulin resistance. Nat Rev Endocrinol. 2014 Dec;10(12):723-36. doi: 10.1038/nrendo.2014.171. Epub 2014 Oct 7. Review.
Zhang S, Zeng X, Ren M, Mao X, Qiao S Novel metabolic and physiological functions of branched chain amino acids: a review. J Anim Sci Biotechnol. 2017 Jan 23;8:10. doi: 10.1186/s40104-016-0139-z. eCollection 2017. Review.
Zhao X, Han Q, Liu Y, Sun C, Gang X, Wang G The Relationship between Branched-Chain Amino Acid Related Metabolomic Signature and Insulin Resistance: A Systematic Review. J Diabetes Res. 2016;2016:2794591. doi: 10.1155/2016/2794591. Epub 2016 Aug 25. Review.
Effect of Insulin Resistance on Branched Chain Amino Acid Metabolism.
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.