[25] has a screen to the registration of the age, physical activity level, gender, weight, height and goals, with graphics display. In the diet area, there is the food database with calories and diet diary register with the calculation of the calories, macronutrients and fluid intake and needed fluids, macronutrients and calories [25].

Lose weight in 30 days [30] allows the registration of age, gender, weight and height, with a graphics display. In the diet area, it records food preferences and suggests a diet plan and a shopping list. In the physical activity section, a training plan is suggested [32].

[32] suggests a diet plan for weight loss. Lose Weight in 30 Days [33] allows the registration of weight and height, calculates the BMI and displays a chart. In the diet area, it allows the recording of food preferences, with the suggestion of a diet plan and shopping a list [33]. In the physical activity area, there is a suggested training plan and an indication of the energy expenditure [33].

[38] suggests a diet plan based on eggs, with nutrition education. Boiled Egg Diet [39] suggests a diet plan based on eggs, with recipes and a shopping list. Healthy Weight Loss Recipes [40] suggests recipes for weight loss. How to Gain Weight Fast [42] has the goal of the gain weight, indicating the food plan and recipes, with education about health and nutrition.

[45] has the goal of weight loss, suggesting the recipes and shopping list. Detox diet plan: Lose fat fast in 7 days [46] features a detox diet, registration of the gender, height and weight with BMI calculation, suggesting a diet plan and education about nutrition, health and physical activity. Weight Loss Smoothies [47] has a screen for the registration of age, gender, height and weight. It also calculates the BMI, fat mass, waist-height relation, suggesting a diet plan, recipes and education about health, nutrition and physical activity. Indian weight loss GM Diet [48] is aimed at weight loss, with the suggestion of diet plan and control of fluid intakes. Simple Diet Diary [49] allows the registration of a diet diary with an indication of the calories and macronutrient intake with a graphics display.

[52] suggests recipes. MyKeto – Low Carb Keto Diet Tracker & Calculator [54] allows the registration of age, physical activity level, gender, weight, height and goals. In the diet section, there is a food database with calories, suggestion recipes and calculate the calories and macronutrients needed. It includes an educational component of health and nutrition [52].

[55] allows the registration of gender, weight and height with graphics display. In the diet area, food database with calories, diet diary, with calorie intake and recipes is featured . Weight Loss – 10 kg /10 days, Fitness App [56] has the goal of the weight loss, with the registration of age, gender, height, weight and BMI and fat mass calculation. In the diet area, there is a suggestion of the diet plan with registration food preferences [56].

[57] has the goal of weight loss, suggesting a diet plan and recipes. 30 Day Workout: Fast Home Weight Loss & Diet Plans [58] has the intention of weight loss with the registration of goals. In the diet area, there is a suggested diet plan and recipes [58]. In the physical activity area, there is a physical activity monitoring with the measurement of the energy expenditure and suggestion of the training plan [58]. Weight Loss Recipes [51] has the goal of weight loss with the advice of the recipes and shopping list. FitMenCook- Healthy Recipes [60] suggests recipes and a shopping list.

[62] allows the registration of weight, height and waist size, suggesting a diet plan. Diet and Weight Loss [64] has the goal of the weight loss with the registration of age, gender, height, weight and goals with BMI calculation. In the diet section, it contains a food database with calories, diet diary, fluid intake, indicated calorie intake, and fluid and calories estimation [64]. It suggests a diet plan and recipes [64]. In the physical activity section, daily exercise with calories burned is registered [64]. In the well-being area, sleep control and reminders are available [64].

[61] allows the registration of age, gender, overweight tendency, pregnancy number and goals. In the sector diet, it will enable the filing of the daily diet with the suggestion of a diet plan and recipes [61]. The registration of mood and emotions with the possibility of reminders is also available [61]. In anthropometric values, the record of weight and height with ideal weight calculation , waist size, breast and hip is also available [61]. Weight Loss 7 Day Diet Plan [66] presents a diet plan for weight loss.

[67] allows the registration of the age, physical activity level, gender, weight, height and goals and with graphics display and reminders. It presents a food database with calories, a daily diet with the counting of calories and macronutrient intake and the calculation of the calories needed [67]. In the physical activity section, a counter of daily exercise and calories burned is presented [67]. FOODMAP Helper-Diet Companion [69] shows the information about the food intake.

[70] allows the registration of age, physical activity level, gender, weight, height and goals. In the diet component, it will enable the filing of a daily diet with the indication of calories and macronutrients intake. In the physical activity component, it presents the exercising frequency [70].

[75] has the goal of the weight loss, allowing the registration of age, gender, weight and height, and the calculation of the BMI. It tracks the diet diary and presents the fluid intake and the calculation of basal metabolic rate [75].

[20] enables the recording of weight and height and calculation of the BMI. It also suggests a diet plan [20].

[77] has the goal of weight loss, allowing the registration of age, gender, weight, height and goals. It includes a module of ideal weight calculation and reminders [77]. In the diet area, it has a food database with calories, allowing the registration of a daily diet and fluid intake [77]. In the physical activity section, it will enable the registration of regular exercise and the possibility of sharing information with another application [77].

Following the mobile applications categorized as “Physical Activity”, My Diet Coach-Weight Loss Motivation & Tracker [22] allows the registration of age, physical activity level, gender, height, weight and goals with BMI calculation. In the diet area, it provides the calculation of fluid intake control and calories needed [22]. In the physical activity area, it presents an exercise diary, with the measurement of energy expenditure and challenges [22]. This mobile application also includes a module related to health and nutrition education, reminders and gamification [22].

[28] allows the registration of age, physical activity level, gender, weight, height and goals. In the diet area, it enables the record of food preferences and the calculation of calories needed [28]. It also suggests the training plan and daily exercise and measures energy expenditure and allows them to share information with other mobile applications [28].

[44] has the goal of weight loss, allowing the registration of weight and health parameters with BMI calculation. It will enable the registration of daily diet with control of fluid intake [44]. It presents a module with training plan suggestions and education about nutrition and physical activity [44].

[59] allows the registration of age, physical activity level, gender, goals and material. It also suggests a training plan and recipes [59].

[74] allows the registration of gender, weight, height, goals and reminders. It includes the physical activity monitoring and measurement of the energy expenditure [74].

[76] promotes weight loss through the practice of yoga. It allows the registration of age, gender, weight, height, waist, breast and hip measurements [76]. It also suggests a yoga training plan with calories burned and reminders [76].

[79] allows the registration of age, gender and anthropometric values, including weight, height, fat mass, waist, neck, breast, forearm, arm, shoulders, leg, hip, thigh and goals. It allows the registration of reminders [79]. In the physical activity area, it suggests a training plan with the filing of a training plan [79].

Following the mobile applications categorized as “Health”, Calories Counter & Diet Plans By MevoFit [26] controls the anthropometric parameters, waist, breast, arm, forearm, thigh, shoulders and leg. In the diet area, it includes a food database with calories, a diet diary with calories and count of macronutrient intake, the calculation of calories needed and the suggestion of the diet plan, recipes and shopping list [26]. In the physical activity area, it includes an exercise diary, physical activity monitoring with the pedometer and the measurement of the energy expenditure [26].

[34] allows the registration of age, physical activity level, gender and goals. The diet area includes a food database with calories, a diet diary, the calculation of calories spent, macronutrients and fluid intake, and the calculation of calories needed, basal metabolic rate and weight index. In the physical activity area, it includes a physical activity monitoring with the measurement of the energy expenditure, daily exercise and challenges [34]. In anthropometrics parameters, it allows the registration of weight, height, waist and hip, calculating the BMI, fat mass, lean body mass and ideal weight [34]. Furthermore , it includes the measurement of heart rate and the registration and targeting of heart rate calculation and sleep control [34]. There is also an educational component of health, challenges and reminders, including the possibility of having a weight-loss coach with connection to other mobile applications [34].

[37] allows the BMI control with the registration of age, gender, weight and height for the calculation of the BMI. Ada-Your Health Guide [65] enables the record of age, gender, weight, height, diabetic, smoker, allergies, current pregnancy and high blood pressure. It includes a medication diary and a health questionnaire for indicated pathologies [65]. It also includes an educational component for health [65]. Weight loss tracker [81] has goals for weight loss, allowing the registration of age, gender, weight, height and goals, calculating the BMI and creation of reminders.

[78] allows the registration of age, physical activity level, gender, weight, height, waist and goals. It includes the calculation and reminders for BMI and fat mass [78]. In the diet section, it shows a food database with calories and the estimate of a diet diary, fluid intake, calories and macronutrients intake and calories needed [78]. In the physical activity section, it also includes the registration of daily exercise, suggesting a training plan with videos and challenges and allowing the physical activity monitoring with other mobile applications [78]. Weight [82] enables the registration of age, physical activity level, gender, height, weight, blood pressure, waist, hip and goals. It allows the calculation of BMI and basal metabolic rate [82].

Following the mobile applications categorized as “Education”, Vegetables for Health [35], Herbs For Health [68], and Fruits for Health [50] are used for educational nutrition.

[43] is related to education about health and nutrition with information about glucose. How To Gain Weight Fast Tips [63] is relevant to teaching about health, nutrition and physical activity. Glycemic Index & Load: low-carb diet & fiber [72] is related to the education about nutrition, including a food database with glycemic index with the registration of weight, height and goals.

Following the mobile applications categorized as “Health”, Lifesum: Food Diary, Meal Planner & Diet Tracker [11] allow the registration of age, physical activity level and gender. In the diet section, it presents a food database with calories, allowing the record of diet diary with calories, fluid intake, food preferences and food questionnaire, calculating the calories counter needed. In the physical activity section, it shows a log of physical activity, and calories burned, allowing to share the information with other mobile applications related to physical activity monitoring [11]. In the health section, it enables the control of anthropometric values, health parameters, including weight, height, and others, and waist size, allowing the calculation of body mass index [11]. It also permits the registration of allergies and goals. In the studies [84-86], the features of this mobile application are only presented. However, in the study [87], significant analysis of the mobile application is performed, showing the advantages and disadvantages of the mobile application. Its benefits remind the user about drinking water, providing feedback to improve the quality of eating, selecting diets for healthy living, and summarizing nutrition and exercise habits. However, this mobile application has disadvantages, including the fact that it is not focused on daily exercise, the data should be inserted manually, and it is slightly difficult to use [87]. The authors present a correlation with body fat [88].

[12] allows the registration of age, physical activity level and gender. In the diet area, it presents a food database with calories and authorizes the filing of a diet diary, the control of calories and macronutrient intake and the calculation of fluid intake and calories needed. In the physical activity area, it allows the monitoring of physical activity with other mobile applications and devices, calculating the calories burned and allowing the registration of an activity diary [12]. Finally, this mobile application allows the control of the weight and the height with the record of goals [12]. The studies [85], [89], and [90] referred to the features of the mobile application, but they lacked the validation of the mobile applications. Moreover , the studies [89], [91], and [92] referred that it is one of the most used mobile applications. In a study [93], the social component of this mobile application was revealed. In a study [94], the authors presented the gamification components of this application. Furthermore , the reviews [95] and [96] referred that the development of this mobile application did not involve medical professionals. The study [97] reported that the significant benefit of this mobile application is the promotion of a therapeutic lifestyle change in patients with diabetes because it includes a food database and the integration with other mobile applications and devices. In a study [98], the authors said that it has excellent advantageous and diabetes-friendly features, including an extensive food database and integration with other mobile applications and devices. In a study [99], the authors referred that this mobile application is reliable for monitoring of energy and macronutrients, but it lacks tracking of micronutrients. Finally, the study [100] concludes the mobile application is reliable for counting the number of calories, but the results returned by the mobile application related to the control of the weight are difficult to understand and are uninteresting.

[16] allows the registration of age, gender, physical activity level, height, weight and goals. In the diet area, it includes a food database with calories, the registration of the diet diary and the calculation of calories and macronutrient intake [16]. In the physical activity section, it includes the monitoring of the physical activity, the sharing of information with other mobile applications, the control of the calories burned and the registration of activity diary and goals [16]. The studies [85], [98], [101-103] only referred to some features of the mobile application.

[17] allows the registration of age, physical activity level, gender, height, weight and goals. In the diet section, it enables the registration of diet diary with the calculation of calories and fluid intake and calories needed. In the physical activity section, it allows the monitoring of calorie burn control [17]. In studies [104-106], the evaluation of the features of the mobile application is presented.

[23] allows the registration of age, physical activity level, gender and goals. In the diet section, it presents a food database with calories, allowing the registration of diet diary and the control of calories, macronutrients and fluid intake, and the calculation of fluid and calories needed as well as the basal metabolic rate [23]. In the physical activity section, it allows the registration of an activity diary and the measurement of calories burned [23]. In the part of the anthropometric values, it will enable the registration of weight, waist, neck and thigh, and the calculation of body mass index and ideal weight [23]. This mobile application is presented in several scientific studies [107-108], but the validation is only offered for the paid version, relating that only 60% of the individuals consider this mobile application better than others.

[36] allows the control of anthropometric values with the registration of age, physical activity level, gender, goals, height, weight, waist, neck, breast, forearm, arm, shoulders, leg, hip, thigh and body structure. It also allows the calculation of body mass index, body fat, ideal weight with the calculation of calories needed [36]. It is presented in the studies [106, 109] with reference to its features.

Fig. (1). Mobile Applications analysis.

[53] allows the registration of age, gender, weight, height and goals with the calculation of the body mass index. In the diet section, this application as a food database with calories, also allowing the registration of a diet diary, calories and macronutrients, as well as the calculation of calories, needed [53]. This mobile application also enables the record of an exercise diary and indicates calories burned [53]. It is presented in a study [85] without any validation procedure, referring only to the features available.

[80] allows the registration of age, physical activity level, gender, height, weight, goals and reminders. In the diet section, it presents a food database with calories, and it allows the registration of diet diary and fluid intake with the indication of calories and macronutrient intake and the calculation of calories needed [80]. In the physical activity section, it allows the registration of an exercise diary, indicating the calories burned and enabling the monitoring of physical activity with other mobile applications [80]. In a study [91], the authors referred that only 2% of the participants in the study used this mobile application. The study [110] only incorporated some features of the mobile application. Finally, this mobile application was used in a case study without reference to its conclusion [111].

[14] presents a food database with calories, allowing the registration of diet diary and the control of calories, macronutrient, caffeine and fluid intake, the education of the user, and the calculation of the calories needed. In the physical activity section, it includes the monitoring and control of the calories burned with a training plan suggestion [14]. In the health section, it allows the registration of pulse, blood pressure, glycemic, fat mass, weight, goals, sleep control and medication diary (insulin) [14]. In the studies [112-115], the authors only referred to the features of this mobile application. In a study [116], the authors revealed a limitation for the detection of outdoor activities. In a study [117], this mobile application was used for the heart rate measurement, comparing its performance with other mobile applications, showing, when compared with a smart shirt, an average difference of around 1.28% and a standard deviation of 0.83%, and, when compared with hexoskin’s app, an average of 31.24% and a standard deviation of 12.07%. On the other hand, some authors [118] compared the mobile application installed in two different smartphones, concluding that the validity of the mobile application depends on the model of the smartphone, its body location and the types of physical activities performed, showing, while running, a Root Mean Squared Error (RMSE) between 2.5 and 5.6 with the smartphone on the hand and RMSE between 3.6 and 4.9 with the smartphone on the arm. On the other hand, while walking, the study reveals an RMSE of 5.4 and an RMSE of 3.7, showing unacceptable results for different positions of the smartphone.

[41] allows the registration of age, physical activity level, gender, height, weight and goals. In the diet section, it presents a food database with calories, allowing the registration of the diet diary with the possibility of submission of a photograph of the food, the indication of calories and macronutrient intake, the calculation of calories needed and the availability of recipes [41]. In the physical activity section, it allows the registration of a physical activity diary with the indication of calories burned and the monitoring of physical activity with other mobile applications [41]. Additionally, the mobile application includes a section to sleep control and reminders about the different functionalities of the mobile application. In the studies [85], [119-121], the authors only referred to the features of this mobile application. Moreover , a study [122] reveals the existence of significant differences between the calorie intake and the calorie measures in the diet diary. In another study [123], it was reported that the results of the calorie counting may be incorrect because it is not based in real practice. With the same conclusion, the authors [124], revealed that the values of calorie intake were 14% greater than the actual costs. The authors [125], [126] compared this mobile application with the Bite Counter, presenting that this mobile application increases the number of weight loss with the increased physical activity.

Following the mobile applications categorized as “Education”, Health and Nutrition Guide [13] allows the registration of age, physical activity level, height and weight. In the diet area, it presents a food database with calories and allows the calculation of calories and macronutrients needed [13]. It has mainly an educational component in health, nutrition and physical activity with the suggestion of home medications [13]. This mobile application has been presented in a study [127-129], but the authors only described its features.

[73] has an educational component about health and physical activity, allowing the registration of recipes and home medication. This mobile application has been presented in a study [130], but it lacks scientific validation.

Following the mobile applications categorized as “Diet and nutrition”, Calorie, Carb & Fat Counter [19] allows the registration of age, physical activity level, weight, height and goals. In the diet section, it will enable the filing of a diet diary, presents a food database with calories, helps in the control of calorie and macronutrient intake, calculates the calories needed, suggests a diet plan and presents challenges [19]. This mobile application has been reported in a study [85] with the presentation of its features.

[21] allows the registration of age, gender, weight, height and goals. In the diet section, it presents a food database with calories, enables the filing of a diet diary, helps in the control of calories and macronutrient intake, and allows the calculation of calories needed [21]. In the physical activity section, it will enable the registration of an activity diary and controls the calories burned [21]. This mobile application is only presented in the studies [131-133], but there are no details given.

[31] allows the registration of age, physical activity level, gender, weight and height. In the diet section, it presents a food database with calories and allows the registration of diet diary with the indication of calories, macronutrient and fluid intake [31]. In the physical activity section, it will enable the listing of the physical log [31]. In a study [98] it has been referred that this mobile application is relevant for the tracking of patients with diabetes, but they found some issues.

Following the mobile applications categorized as “Physical activity”, Pedometer, Step Counter & Weight Loss Tracker App [27] allows the registration of age, physical activity level, gender, weight, height and goals, and the calculation of the body mass index. In the main page, it allows the monitoring of physical activity with the control of calories burned, challenges and gamification. In a study [134], the authors only described the features of this mobile application. In a study [135], it was reported to use for data acquisition.

[71] allows the creation of goals for weight loss, with the suggestion of training plan, gamification and reminders. This mobile application has been presented in research [136], describing some features.

[83], allows the registration of age, physical activity level, gender, weight and height. It allows the calculation of calories needed and basal metabolic rate. Furthermore , it suggests a training plan with videos. This mobile application is not validated, but it is presented in an investigation [137].