This systematic review examines the critical issue of improving nutrition globally, addressing the challenges of malnutrition, undernutrition, and overnutrition. The study explores the impact of unhealthy eating habits on public health, including the rise of chronic diseases like hypertension and type-2 diabetes, especially among younger generations. The review highlights the importance of a balanced diet, integrating macronutrients and micronutrients, and the need for comprehensive strategies to combat nutritional imbalances. It presents data on the prevalence of malnutrition worldwide, referencing WHO reports, and emphasizes the vulnerability of specific populations, such as women, children, and those in poverty. The methodology includes a search of multiple electronic databases, focusing on English language publications from 2014 to the present, using keywords like "nutrient" and "malnutrition." The review aims to contribute to a better understanding of nutrition improvement and assist researchers and policymakers in targeting populations in underdeveloped and developing countries. The conclusion emphasizes the importance of collaborative efforts to improve the accessibility, affordability, and availability of healthy diets, supported by evidence-informed guidelines and effective action plans.