Diet Comparison: Animals Affected Per Year
A side-by-side comparison of five diets and their estimated annual animal impact.
Estimates are per person per year and intended to show directional differences, not precise counts.
| Metric | Vegan | Vegetarian | Flexitarian | Pescatarian | Omnivore |
|---|---|---|---|---|---|
| Land animals killed per year (approx) | ~0 | ~2 (dairy/eggs byproducts) | ~30 | ~5 land + ~100 fish | ~100+ land animals |
| Fish/aquatic animals | 0 | 0 | ~50 | ~150 | ~50 |
| Total estimated animals | <5 | ~5-10 | ~80 | ~160 | ~150 |
| Greenhouse gas | lowest (1.5 tons CO2e/yr food) | low (1.7 tons) | medium (2.4 tons) | medium (2.0 tons) | highest (3.3 tons) |
| Difficulty of transition | Very hard | Hard | Moderate | Moderate | N/A |
| ACE recommendation alignment | Highest | High | Moderate | Moderate | Low |
Numbers are rounded for clarity and reflect typical U.S. consumption patterns.
These estimates combine USDA consumption data, Tomasik's animal numbers research, and FAO livestock statistics. Fish estimates use wild-caught averages.
Key uncertainty: animal welfare depends on conditions and suffering intensity, not just numbers. A factory-farmed shrimp and a grass-fed cow are not morally equivalent, so the table focuses on scale rather than full ethical weight.
Small, consistent shifts build momentum. Choose the path that feels doable this month.
Pick 5 reliable plant-based meals you already like. Add a simple B12 supplement to cover basics.
Start with breakfast swaps (plant milk, oatmeal). Make two dinners per week egg-and-dairy free.
Set a weekly meat budget and stick to it. Replace chicken with legumes or tofu on weeknights.
Cap fish meals to 2-3 per week. Prioritize plant-forward sides to keep totals lower.
Explore the tools and actions that make changes stick.