There is a market for it, but it's such a narrow product that it has to be developed not only for chips, but also other healthy foods to generate any organic traffic.
Diet[better: Foods].com would be better as it serves all different diet food items. (5400 exact vs. 36).
I don't see any value in developing this domain unless you actually want to go through with the setup process. Rather, seek an end user who sells diet products and sell dietchips.com to redirect to their page on chips for sale. I think that would be the best solution.
As there is low competition on diet chips and low search volume, you may be able to rank high. However, with a CPC as high as 20 cents, is it worth your time to develop something that may only attract 10 users a month to with a 4% CTR? That barely breaks ROI on the domain renewal price yearly.
Factor in your time vs. income and I see that itâs a waste. Park & sell, if no sell drop it IMO.