How can you lose weight on a vegan diet? RD Natalie Allen explains. October 4, 2019 by university communicationsShare:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)A vegan diet means eliminating animal foods. If you eat properly, you can lose weight and avoid nutrient deficiencies. Natalie Allen, a registered dietitian and clinical instructor of biomedical sciences at Missouri State University, offers some tips and advice to Openfit about practicing a vegan diet.