VERDICT: FALSE — the specific number is wrong by about three orders of magnitude. The claim "roughly checks out" only if the intended figure was **~1.1 quadrillion (1.1 × 10¹⁵) kcal**, not 1.1 trillion (1.1 × 10¹²) kcal. As written, the total caloric content of humanity is roughly **1,000 times larger** than the claimed value. **The math, from primary sources:** 1. **Per-human energy content (~125,000–144,000 kcal per average adult body).** The only peer-reviewed "full nutritional template" of the human body — Cole, *Scientific Reports* 7:44707 (2017) — reports, in Table 1, that a composite ~66 kg adult male body contains **143,771 kcal** total, and that the body parts typically consumed (~55 kg) contain **125,822 kcal** ([Cole 2017, PMC full text](https://pmc.ncbi.nlm.nih.gov/articles/PMC5382840/); [same article on nature.com](https://www.nature.com/articles/srep44707)). These "calories" are food kilocalories (the paper's own reference values are ~4 kcal/g protein / 9 kcal/g fat). So the "125,000-ish calories per human" fact the TikToker presumably used is real — but per *person*, not in total. 2. **Population multiplier (~8.2 billion).** The UN's World Population Prospects 2024 (the underlying intergovernmental data product) puts world population at **8.2 billion in 2024** and growing ([UN DESA WPP 2024 Summary of Results PDF](https://population.un.org/wpp/assets/Files/WPP2024_Summary-of-Results.pdf); official portal [population.un.org/wpp](https://population.un.org/wpp/); UN's own accessible summary states the population "reached nearly 8.2 billion by mid-2024" — [UN News](https://news.un.org/en/story/2024/07/1151971)). The World Bank's population series (sourced from UN WPP) also runs to ~8.2 billion for 2025 ([World Bank, Population total](https://data.worldbank.org/indicator/SP.POP.TOTL)). 3. **Multiplication: 8.2 × 10⁹ × 125,822 kcal ≈ 1.03 × 10¹⁵ kcal; 8.2 × 10⁹ × 143,771 kcal ≈ 1.18 × 10¹⁵ kcal.** That is roughly **1 quadrillion kcal ≈ 1,000 trillion kcal** — about a thousand times the claimed 1.1 trillion. Even cutting the per-person value drastically to account for children and lower-weight adults (global average adult mass is only ~62 kg, and a tonne of adult biomass corresponds to ~12 adults in North America vs ~17 in Asia — [Walpole et al., *BMC Public Health* 12:439, 2012](https://link.springer.com/article/10.1186/1471-2458-12-439)), the total stays in the ~10¹⁴–10¹⁵ kcal range, never near 10¹². **Claim-linked findings:** - An average adult human body contains ≈125,000–144,000 kcal (food kilocalories) — established by the peer-reviewed Cole (2017) nutritional template. - 1.1 trillion kcal spread over ~8.2 billion people would mean ~134 kcal per human (about one small snack) — physically impossible, since even a lean body's fat + protein stores are ~100,000+ kcal. The figure that *does* roughly check out is ~1.1 quadrillion kcal (1.1 × 10¹⁵), i.e., 8 billion people × ~134,000 kcal each. The viral claim therefore appears to be a "trillion/quadrillion" scale error: the underlying fact is roughly right at the quadrillion level, but the stated total of 1.1 trillion calories is off by ~1,000×. Key sources (all opened): [Cole 2017 PMC full text](https://pmc.ncbi.nlm.nih.gov/articles/PMC5382840/) · [Cole 2017, Scientific Reports](https://www.nature.com/articles/srep44707) · [UN DESA World Population Prospects 2024](https://population.un.org/wpp/assets/Files/WPP2024_Summary-of-Results.pdf) · [UN News (WPP 2024 findings)](https://news.un.org/en/story/2024/07/1151971) · [Walpole et al. 2012, BMC Public Health](https://link.springer.com/article/10.1186/1471-2458-12-439) · [World Bank population data](https://data.worldbank.org/indicator/SP.POP.TOTL)