## 1 Introduction  
Theoretical literature is crucial to building a strong assumption of the model structure by gathering facts from previous research studies and reviews about each mechanism related to weight management. Alternatively, elements and variables that actively interfere with Medical Nutrition Therapy (MNT) are to be determined based on their effect on obesity financially and economically. The gatheredassumptions in terms of variables are used to build a series of hypotheses for which a questionnaire addressed to a pool of Lebanese adults shall be compared statistically to check the validity of each hypothesis and its application in Lebanon. Worldwide obesity has more than doubled since 1980. World Health Organization (WHO) figures indicate that obesity is spreading around the world as a \"global epidemic\". However, the proportions vary from country to country and within geographical areas in the same country [1; 2]. Nowadays, excess weight or obesity affects 30-70% of the general population. In recent years, Lebanon has been experiencing a nutritional transition in food choices from the typical Mediterranean diet to the fast-food pattern. As a consequence, the dietary habits of young adults have been affected; thus, overweight and obesity are increasingly being observed among the young [3]. In Lebanon, similar to other Eastern Mediterranean countries, the rate of overweight and obesity among adults is reported to follow an escalating secular trend, with its prevalence estimates increasing from 54.4% to 65% over the past decade [4]. In a more recent study, Lebanese body mass index (BMI) above the normal range was estimated to be 62.8% (men 67% and women 58.7%) among which 28.2% are obese, which is alarmingly high [5]. The growth of overweight problems could be justified by either a higher intake of calories or a lower expenditure of calories in daily activities [6], assuming that obesity is the result of a positive energy surplus between calories consumed and calories expended, resulting in excess body weight. Exposure to palatable food temporarily also inhibits thoughts about dieting in chronic dieters and leads to overeating [7]. Alternatively, obesity was found to be associated with an increased risk of all-cause and cardio-vascular disease mortality, raising the risk of morbidity from hypertension, dyslipidemia, type 2 diabetes mellitus (diabetes), coronary heart disease, stroke, gallbladder disease, osteoarthritis, sleep apnea and respiratory problems, and some cancers [8]. According to prior literature, between 15% to 20% of people in the general population are only successful at long-term weight loss maintenance, which is defined as being intentionally losing and keeping the loss of \(\geq\) 10% from initial weight for \(\geq\) 1 year [9; 10; 11; 12]. Reasons attributed to diet failure could be linked to hormones and other homeostatic, environmental and behavioural factors, but the most common reason is attributed to stress and food deprivation [13; 14; 15; 16]. This low percentage of successful weight loss is also applied in Lebanon [17]. It could be improved when setting a customised protocol in Medical Nutrition Therapy (MNT), which addresses individual nutrition needs based on personal and cultural preferences, health literacy, and access to healthful foods. The goals of MNT are to promote and support healthful eating patterns, emphasising a variety of nutrient-dense foods in appropriate portion sizes to achieve/maintain body weight and health goals. MNT is a valuable adjunct to health management programs that can be implemented for a relatively low cost [18]. By using a medical model, clinicians can provide more proactive and effective treatments in assisting their patients with weight loss [19]. Noting that anthropometric indicators used during general assessment of overweight and obesity are based on Body Mass Index (BMI), neck and waist circumferences and body shape type, which favours the apple shape for obese individuals.