I think it’s more likely that you just didn’t notice it.
My lay observation is that “food security” has been the standard term in non-profit/NGO contexts for at least 15 years, while “hunger” is still colloquial. My guess for why is precision.
Maybe it's the same Euphemism Treadmill that George Carlin performed[1] about, how "Shell Shock" evolved into the softer, jargony "Post Traumatic Stress Disorder"
I think "shell shock" vs. "PTSD" is a poor example of euphemistic language. The name "shell shock" is just inaccurate and misleading. It's a product of the poor understanding we had at the time. It would be confusing to explain how someone got shell shock from sexual assault, for example.
The intermediate names Carlin mentions, however, are absolute euphemistic bullshit. "Battle fatigue" and "operational exhaustion" were strictly rebrands with the intent of minimizing the problem.
My lay observation is that “food security” has been the standard term in non-profit/NGO contexts for at least 15 years, while “hunger” is still colloquial. My guess for why is precision.