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The purpose of this study was to assess individuals’ satisfaction with their diet programs and evaluate the impact of their diet on their quality of life (QOL).

This cross-sectional study was conducted with 812 females and 334 males (n = 1,046) aged 18–65 years, all of whom were following a diet program under the guidance of a dietitian. The questionnaire included personal information as well as items related to dietary satisfaction and QOL, measured using the SF-36 scale.

Of the participants, 38.4% were aged 18–24, and 32.6% were aged 25–40. The mean score for dietary satisfaction was 3.0 ± 0.9 (out of 5), while the mean scores for the mental and physical components of the QOL scale were 62.0 ± 17.8 and 74.3 ± 19.2, respectively. Factors such as age, BMI and duration of the diet were associated with dietary satisfaction, whereas age, gender, health status, diet type and BMI impacted QOL (p < 0.05). Dietary satisfaction scores showed a weak positive correlation with QOL scores (r = 0.125; p < 0.01).

Dietary satisfaction and QOL are influenced by demographic characteristics, health status, diet type and the duration of the diet program. Additionally, there is a correlation between dietary satisfaction and QOL. To ensure the sustainability and suitability of long-term dietary plans, it is crucial to monitor patients’ dietary satisfaction. In this context, assessing the QOL in individuals on diet programs, using a newly validated diet satisfaction scale, adds originality and value to the study.

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.