The claim

“how many people in the world will not eat today”

There is no single rigorously knowable number of people who "will not eat today," but global hunger monitors estimate that hundreds of millions experience hunger or food insecurity, and a substantial subset likely goes a full day without eating at times.

The phrasing "will not eat today" is ambiguous: it could mean complete fasting for 24 hours, having zero calories, or not having an adequate meal, and it also implies a real-time daily count that is not directly measured globally. Major international trackers (FAO/IFAD/UNICEF/WFP/WHO and WFP) publish estimates of chronic undernourishment and of acute food insecurity, which are the closest rigorously-produced metrics, but they are not daily headcounts and do not translate cleanly into "did not eat today." The latest widely cited figures indicate about 733 million people faced hunger in 2023 (FAO et al., SOFI 2024), and WFP commonly reports hundreds of millions facing acute food insecurity, but neither source provides a precise daily number of people who do not eat at all. A rigorous answer requires defining the term (no food vs. insufficient food) and the time window (a specific date/region), otherwise the claim cannot be verified as stated.