TABLE 3.

Greenhouse gas emissions and quality of diets as reported by consumers, NHANES 2005–2010¹

Diet	n	GHGE kg CO2-eq/1000 kcal	Healthy Eating Index	Alternate Healthy Eating Index
		Mean ± SE	Mean ± SE	Mean ± SE
Omnivore	14,175	2.23 ± 0.01d	48.92 ± 0.33c	33.89 ± 0.29d
Vegetarian	1179	1.16 ± 0.02b	51.89 ± 0.74b	42.05 ± 0.64b,c
Pescatarian	778	1.66 ± 0.04c	58.76 ± 0.79a	51.61 ± 0.72a
Vegan	141	0.69 ± 0.05a	51.65 ± 2.58a,b,c,d	44.57 ± 1.89b
Keto	77	2.91 ± 0.27d	43.69 ± 1.61d	36.13 ± 1.91c,d
Paleo	62	2.62 ± 0.33c,d	45.03 ± 2.37b,c,d	33.86 ± 2.37d

n, sample size; GHGE, greenhouse gas emissions. ¹Analyses used survey-weighted ordinary least-squares regression. Each column represents a different regression for which the variable in the header was the dependent variable, and diet was a categorical independent variable with 6 levels corresponding to each of the 6 different diets reported. ^a-d Means sharing a superscript letter were not significantly different (P < 0.05) using posttest pairwise comparisons with a Bonferroni adjustment. Superscript letters are ordered by desirable outcome: that is, in ascending order beginning with “a” at the lowest GHGE value and descending order with “a” at the highest diet quality value.