"So you say that food (in parenthesis) is excluded."
I don't say anything. The FDA says explicitly, and case law demonstrates, that even liquids or foods that make medical claims are to be classed as drugs.
Here it is again:
"How does the law define a drug? The FD&C Act defines drugs, in part, by their intended use, as "articles intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease"and* "articles (other than food) intended to affect the structure or any function of the body of man or other animals" [FD&C Act, sec. 201(g)(1)]."
*drugs don't have to meet both definitions - either is sufficient (but not always necessary).
The exclusion of food from the second definition does not mean it's excluded from the first. If anyone though about that for a short while, they would realise why.