“It is not clear whether crickets fed on high Ca diets provide sufficient quantities of all nutrients required by insectivorous species. Nutrients such as trace minerals, amino acids, and vitamins could still be limiting, but knowledge of the nutrient composition of insects and invertebrates is very incomplete.”…
https://repository.si.edu/bitstream/handle/10088/3796/Allen1989.pdf?sequence=1
https://repository.si.edu/bitstream/handle/10088/3796/Allen1989.pdf?sequence=1