Introduction and objective:
The purpose of this follow-up study on the implementation of advanced closed-loop hybrid insulin pumps in people with type 1 diabetes was to assess the impact of introducing this advanced technology on quantitative and qualitative parameters of diet.

Material and methods:
18 patients (8 women and 10 men, mean age 40.9 years) patients using the CE-marked MiniMed 780G AHCL system who completed 1 year of follow-up were included into the study. The research tool was the KomPAN questionnaire with several own questions added, asked in three study periods, concerning the number of meals consumed, general and night snacking, carbohydrate counting, frequency of consumption of various groups of products that affect postprandial glycaemia.

Results:
Although the mean body weight of the examined group did not increase significantly (from 75.1 kg at the beginning to 75,9 kg at the end), five various individual scenarios of weight change were observed. The eating habits has not changed, but patients began to consume less products containing simple sugars, e.g. fruit preserves, milk chocolate or fish in sauces (p<0.05). No statistically significant correlation was found between the change in body weight at the end of the study and the average amount of carbohydrates entered into the pump from the entire 12 months (p = 0.460).

Conclusions:
The implementation of AHCL system in technology naïve patients, despite offering more freedom of food choices due to better glycaemic control, did not have a significant impact on patients’ dietary patterns, also did not result in weight gain. This is important since AHCL system offers more freedom of food choices due to better glycaemic control. However, the longer follow up and the study based on larger population is required to finally address the issue of the impact of AHCL on body mass.