TABLE 1.
Relative difference (percentage) in GHG emissions, land use, and water use shifting from current dietary patterns to vegetarian diets1
| GHG emissions | Land use | Water use | ||||
|---|---|---|---|---|---|---|
| Median (min, max) | n | Median (min, max) | n | Median (min, max) | n | |
| Current review | ||||||
| Ovolactovegetarian | −35 (−13, −85) | 29 | −42 (−27, −74) | 10 | −28 (−7, −522) | 11 |
| Vegan | −49 (−23, −89) | 20 | −49.5 (−29, −80) | 10 | +17 (−22, +107) | 4 |
| Aleksandrowicz L et al. 2016 (65) | ||||||
| Ovolactovegetarian | −31 (−15, −58) | 20 | −51 (−28, −67) | 7 | −37 (−16, −522) | 9 |
| Vegan | −45 (−23, −72) | 14 | −55 (−40, −80) | 6 | +107 | 1 |
| Hallström E et al. 2015 (22) | ||||||
| Ovolactovegetarian | −24 (−18, −32) | 7 | −39.5 (−27, −52) | 2 | — | — |
| Vegan | −33 (−23, −53) | 6 | −51 (−50, −59) | 3 | — | — |
1
Elaborated with data from the original studies included in the previous revisions. Computations are ours. n = number of dietary scenarios assessed. —, no reported data. GHG, greenhouse gas.
2
Both revisions detected an outlier (+85%).