The aim of this literature review is to examine and contrast four dietary patterns to evaluate their influence on Alzheimer's prevention. The need for this study arises from the lack of a comprehensive analysis definitively confirming the effectiveness of these diets in preventing this disease. An exhaustive literature review was conducted, including clinical trials, systematic reviews, meta-analyses, online books, guidelines, etc. However, only articles from studies, clinical trials, and controlled randomized trials were used for discussion. Exclusion criteria were: publication period of 5 years, articles published in indexed journals and in databases such as PubMed, COCHRANE, or Google Scholar, with an impact factor equal to or greater than 1.5. It has been evidenced that the four diets can offer benefits in Alzheimer's prevention. However, when selecting the most effective diet in Alzheimer's prevention, it is necessary to consider different types of nutritional approaches such as engaging in physical activity to improve cognitive decline.It has been demonstrated that the four investigated diets offer significant benefits in Alzheimer's prevention. Although the MIND diet emerges as a promising strategy, combining the benefits of the Mediterranean and DASH diets. Integrating this diet with practices such as mindfulness and physical activity is important to promote long-term brain health and reduce the risk of cognitive decline, thus maximizing Alzheimer's prevention.

Obesity, according to WHO ICD-11, is a chronic multifactorial disease characterized by excessive adiposity that impairs health. It is a growing global problem, with a prevalence of 44% in adults in 2022. In Spain, obesity affects 16.5% of men and 15.5% of women over 18 years of age. Dietary and nutritional strategies for its treatment include calorie restriction, intermittent fasting and time-restricted feeding (ART), which aligns intake with circadian cycles, showing benefits in reducing body weight. Recent studies highlight ART as effective, although the evidence is mixed. Time criteria (maximum 5 years old) and type of intervention (clinical trials) were determined for the search and literature review of scientific evidence related to time-restricted feeding and its impact on obesity. Pubmed was the main database used, from which a total of 13 clinical trials were analyzed in detail. Time-restricted feeding is a good alternative strategy for the treatment of obesity.