None of the major Aid Charities as far as I know promote a vegan diet, despite it being the only sustainable one for the planet and the fairest way to feed the world’s population. Most promote the exploitation of animals. Some promote abortion.
These Aid Charities do promote a vegan diet, and deserve support:-
1) A Well Fed World (http://awfw.org/)
2) Food for Life Global (http://www.ffl.org/)
3) Fruit Tree Planting Foundation (www.ftpf.org)