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The evaluation of sustainable eating behaviors of individuals who constitute the society is important in the interpretation of both health-related and environmental effects. Therefore, this study aims to develop a valid and reliable scale to assess the sustainable food consumption behaviors of adults living in Turkey.

The validity of the scale was evaluated by using the factor analysis, correlation analysis and comparison of the lower and upper 27% groups with the t-test technique. Cronbach’s alpha (CA), split-half, parallel and strict criteria were used to determine the internal consistency of the scale, and the Pearson correlation analysis was conducted for the test and retest. The explanatory factor analysis and confirmatory factor analysis were applied to test construct validity.

The total variance rate explained by all the factors was 77.03%. CA value of the scale was 0.92, and the test–retest reliability coefficient was 0.96. The difference between the lower and upper 27% group means was significant at the p < 0.05 level. The factor structure of the scale was confirmed by the results of the confirmatory factor analysis.

There are scales in the international literature that have been validated to evaluate various aspects of behaviors related to sustainable food consumption (Tobler et al., 2011; Verain et al., 2015). However, to the best of the authors’ knowledge, there are no validity and reliability studies of a scale developed in Turkey on sustainable food consumption of adults.

Lactose intolerance is lactose digestive disorder due to lactase enzyme deficiency. This can affect the quality of life by restricting the intake of certain foods. The aim of this study is to show the lactose intolerance to the restriction in food intake and quality of life.

This study was conducted with adults aged 18–60 years. A survey was used to gather information on the demographic characteristics of the patients and their symptoms related to lactose intolerance. In addition, the Visual Analog Scale was administered to identify common symptoms and the World Health Organization Quality of Life (WHOQOL)-Bref Quality of Life Scale to determine their quality of life.

The average quality of life subscale scores was 56.25 ± 14.06 for physical, 58.29 ± 11.72 for mental, 63.28 ± 21.35 for social and 62.36 ± 16.37 for environmental. When VAS scores obtained for the common digestive system symptoms in lactose intolerance were compared with Quality of Life scores; it was found that physical life quality scores decreased (r = −0.239, p = 0.030) as the complaints of diarrhea increased and physical and environmental life quality decreased (r = −0.316, p = 0.004/r = −0.277, p = 0.012, respectively) as abdominal pain increased.

People reduce dairy consumption due to digestive system complaints. Therefore, it is important to inform the people about the effects of lactose intolerance because discomfort caused by intolerance can affect nutrient intake and lower the quality of life.