“…More than half of the studies focused on apps [ 28 , 29 , 31 , 32 , 34 , 35 , 38 , 40 , 42 , 44 , 45 ] or websites [ 36 , 41 ] promoting physical activity, while the rest involved diet-promoting apps [ 30 , 33 , 49 ], or diet- and physical activityâpromoting apps [ 39 , 43 , 46 - 48 , 50 ] or websites [ 37 ]. The most commonly applied behavior change techniques according to behavior change technique taxonomy [ 51 ] were (presented in descending order) feedback and monitoring (category 2) [ 28 - 31 , 33 , 35 - 42 , 44 - 48 ], goals and planning (category 1) [ 29 - 31 , 35 , 36 , 38 , 40 , 44 , 47 , 48 , 50 ], social support (category 3) [ 28 , 31 , 37 , 44 , 47 , 48 ], and rewards and threats (category 10) [ 29 , 31 , 33 , 38 , 44 , 48 ].…”