## 3 Results
### Analysis of the Composition and Nutritional Value of the Tested Rice Drinks
\begin{table}
\begin{tabular}{l c c c c c c c c c c} \hline \hline
**Energy and Nutritional Value** & **RB\_1** & **RB\_2** & **RB\_3** & **RB\_4** & **RB\_5** & **RB\_6** & **RB\_7** & **RB\_8** & **RB\_9** & **RB\_10** \\ \hline Energy value & kcal/100 mL & 47 & 50 & 55 & 54 & 50 & 50 & 54 & 54 & 52 & 37 \\ kJ/100 mL & 200 & 212 & 229 & 230 & 209 & 211 & 229 & 228 & 221 & 158 \\ \hline Fat & g/100 mL & 1.0 & 1.1 & 1.0 & 1.0 & 1.3 & 1.3 & 1.0 & 1.0 & 0.9 & 0.6 \\ of which s. f. a.* & 0.1 & 0.1 & 0.1 & 0.1 & 0.2 & 0.2 & 0.1 & 0.1 & 0.0 & \textless{}0.1 \\ \hline Carbohydrates & g/100 mL & 9.5 & 9.9 & 11.0 & 11.0 & 9.2 & 9.6 & 11.0 & 11.0 & 11.0 & 8.0 \\ of which sugars & 3.3 & 7.1 & 7.5 & 6.0 & 4.3 & 3.5 & 5.0 & 5.0 & 7.8 & 4.0 \\ \hline Protein & g/100 mL & 0.1 & \textless{}0.5 & \textless{}0.5 & 0.2 & 0.1 & \textless{}0.1 & \textless{}0.5 & 0.3 & 0.0 & \textless{}0.5 \\ \hline Salt & g/100 mL & 0.09 & 0.08 & 0.1 & 0.1 & 0.12 & 0.06 & 0.1 & 0.07 & 0.1 & 0.08 \\ \hline Fiber & g/100 mL & 0.0 & \textless{}0.5 & \textless{}0.5 & 0.3 & 0.3 & 0.0 & \textless{}0.5 & 0.1 & 0.0 & \textless{}0.5 \\ \hline Vitamin B12 & \textgreater{}100 mL & 0.38 & - & - & - & 0.38 & - & - & - & - & - \\ \hline Vitamin D & \textgreater{}100 mL & 0.75 & - & - & - & 0.75 & - & - & - & - & - \\ \hline Calcium & mg/100 mL & 120 & - & - & 120 & - & 120 & - & - & - & - \\ \hline \hline \end{tabular} s. f. a.*–saturated fatty acids.  
\end{table} 
Table 2: The energy value and nutrient content of the tested rice drinks. depending on the type of raw material and the heat treatment processes used. The lowest content of this nutrient was found in drinks obtained from red rice (from 1.14 \(\pm\) 0.11 g/100 to 1.19 \(\pm\) 0.01 g/100 g), was higher (from 1.48 \(\pm\) 0.03 to 1.52 \(\pm\) 0.02 g/100 g) for white rice, and the highest for drinks obtained from black rice, ranging from 1.69 \(\pm\) 0.09 to 1.75 \(\pm\) 0.00 g/100 g.  
According to the literature, the fibre content in rice drinks is usually approximately 0.3 g/100 g of product [30] or 0.34 \(\pm\) 0.25 g/100 mL [31]. Other authors report that rice drinks contain little or no fibre [6]. [PERSON] et al. (2023) [31] showed that half of the 21 commercial rice drinks analysed in their work did not contain fibre. Similarly to the low protein content, the negligible or complete lack of dietary fibre in these drinks results from the purification of rice grains during the production of this type of drink [20; 30; 31]. Of the ten analysed rice drinks, only two contained added vitamins B12 and D (0.38 ug/100 mL and 0.75 ug/100 mL, respectively) and three contained calcium (120 mg/100 mL). Other authors also report that rice drinks are very often fortified with vitamins (e.g., B12, D, A, E) and minerals (e.g., calcium, potassium, phosphorus) in such quantities that they contain similar levels of these components to cow's milk [21; 30; 31]. [PERSON] et al. (2018) [32] showed that the calcium content of the tested rice beverage was 118 mg/100 mL, i.e., very similar to the calcium content of the RB_1, RB_4, and RB_5 drinks studied in this work (120 mg/100 mL). According to [PERSON] et al. (2023) [30], the calcium content in rice drinks is approximately 118 mg/100 g, while in the research of [PERSON] et al. (2023) [31] the content of this ingredient for 21 analysed market products was on average 108.00 \(\pm\) 26.8 mg/100 mL. On the other hand, in the study performed by different authors determining the nutrient profile of various rice drinks, it was found that these drinks contained an average of 0.3 mg vit. B12/100 mL, 3.0 mg vit. E/100 mL, 60 ug vit. A/100 mL, and 2.5 ug vit. D/100 mL [11]. According to [PERSON] et al. (2023) [30] and [PERSON] et al. (2020) [33], there is a wide range of products on the market, commonly referred to as plant milk substitutes; however, to achieve vitamin and mineral profile similar to that in cow's milk, these ingredients are added to some plant-based drinks during their production process.