Are the results of this research scientifically reliable?

The food intake of the people with lung cancer was revealed only after being diagnosed, which significantly qualifies the suggestion that carbohydrates enhance the risk of lung cancer. In addition, different methodologies were used to determine food intake in the two groups. This affects the impartiality of the results. Consequently, this study's research methodology falls short in establishing an association between glycemic level and lung cancer. Relying solely on the results of the study, a hypothesis that suggests carbohydrates enhance the risk of lung cancer cannot be asserted. About the association between glycemic index and lung cancer, more research is needed, and the underlying biological mechanisms of this relationship must be better understood.

What do the authorities say about the intake of carbohydrates?

Carbohydrates are the most important source of energy in a balanced diet. EFSA identifies two types of carbohydrates. Carbohydrates which has glycemic response are digested and absorbed in the human small intestine. Other carbohydrates are non-digestible dietary fibers. EFSA does not recommend a definitive amount of dietary glycemic carbohydrates because it varies according to the intake of fats and proteins. EFSA proposes 45 to 60 percent as the reference Intake range for carbohydrates applicable to both adults and children older than one year of age.

References:
1. http://www.efsa.europa.eu/en/efsajournal/pub/1462