To cite package ‘DIETCOST’ in publications use:

  Bracarense H, Marquezine T, Claro R (2025). _DIETCOST: Calculate the
  Cost and Environmental Impact of a Ideal Diet_. R package version
  1.0.0.0, <https://github.com/hbracarense/dietcost>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {DIETCOST: Calculate the Cost and Environmental Impact of a Ideal Diet},
    author = {Henrique Bracarense and Thais Marquezine and Rafael Claro},
    year = {2025},
    note = {R package version 1.0.0.0},
    url = {https://github.com/hbracarense/dietcost},
  }