Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We have issued our report dated March 16, 2016, with respect to the financial statements included in the Annual Report of Interleukin Genetics, Inc. on Form 10-K for the year ended December 31, 2015 contained in this Registration Statement and Prospectus. We consent to the use of the aforementioned report in the Registration Statement and Prospectus and to the use of our name as it appears under the caption “Experts.”

/s/ Grant Thornton LLP

Boston, Massachusetts

March 22, 2016