Double diffusion encoding MRS (DDE-MRS) was shown to be highly sensitive to cell microstructure, in particular cell fiber diameter. Here we revisit the ability of DDE-MRS to probe microstructure by quantifying DDE-MRS signal for six metabolites with high accuracy. We show that signal modulation differs for neuronal and glial metabolites, yielding larger fiber diameters for glia when using a model of isotropically oriented cylinders, as previously reported. However, fiber diameters appear overestimated. Further data acquisition and modeling suggests DDE-MRS is not only sensitive to fiber diameter but also to other microstructural features, such as cell body diameter or fiber length.