I have read quite a bit about food and often seen all sorts of criticisms about meat rather than plant food. I think a plant based diet is the key to a low impact.
When plant based foods come in for criticism, its rice (high carbon footprint) and avocados and almonds (water) that seem to be among the claimed offenders.
I haven't heard much about quinoa after reading tons about environmental and other impacts of food, and that suggest to me it may be OK.
A quick google ...I find this....
Quinoa boasts an array of nutrients, including protein, lysine, iron, and more, making it a staple for vegetarians, vegans, and health-conscious individuals. But what we don't know is how quinoa production is damaging the environment in South America.
www.onegreenplanet.org
which says
"In recent years, human rights activists have
raised concerns over whether the seed’s booming sales have
adversely affected the Bolivian and Peruvian farmers that rely on quinoa as a staple in their own diets. As a result of its popularity, the price of quinoa has skyrocketed in the countries where it is grown, and farmers are scrambling to grow enough to meet the demand."
But hang on a minute. Doesn't that mean wealth transfer from the West to Bolivia, that might be a good thing. I bet the Bolivians as a nation would rather have higher prices for their quinoa than lower, all things considered.
I also travelled around Bolivia once and Quinoa wasn't a staple dish, actually, at least not in restaurants and street stalls. They tend to eat rice and chips so it's not like they are going to starve. Bolivia is a poor country, but people are not starving.
Here's another article
Mother Jones: Quinoa's rise from local food to global commodity has carried a high environmental and social cost, but that doesn't mean you should stop eating it
www.theguardian.com
It's saying Bolivians can no longer afford to eat it regularly
Then again, if the Bolivians are selling this for foreign $$, hopefully taxes are getting paid on it, and it's funding Bolivia's health care and so on.
Who's to say the benefits don't out weight the good?
I wouldn't worry about it.