The literature review focuses on exploring the effects of social isolation and loneliness on older adults and finding the factors contributing to these states. Overall, it is possible to say that the paper achieves its purpose and has numerous advantages that make it good research. In paragraph number one, the author provides the thesis statement formulated in the first sentence and introduces the issue to the readers by defining both loneliness and social isolation and talking about several negative complications. The strong introduction that gives the background of the topic is the main advantage of this paper. The author also lists a number of factors contributing to the development of these states, including the loss of friends or family, living alone, hearing problems, and chronic illnesses.
The second paragraph is devoted to the discussion of possible complications like the risk of premature death, obesity, dementia, depression, anxiety, and other issues. It also provides a consistent explanation of how exactly older adults can get their social support system reduced. In the following paragraph, the main point is that the increasing prevalence of the nuclear family and reduced communication with family members and neighbors or the community are the three factors that isolate elderly people. Maintaining high-quality relationships may reduce the risk of older adults developing these conditions and protect their brains from the impacts of loneliness. However, one intervention is not enough, and it would make the paper stronger if the author mentioned whether there are any other methods. Finally, in the last paragraph, the author talks about the frequency of isolation in female and male elderly diabetic patients or patients of different ages.
Overall, the paper seems professional and strong, but several improvements are required. First of all, the manuscript needs significant editing for writing quality and language as it has numerous grammatical and punctuation errors. Further, not all authors indicated in the reference list are also mentioned in the paper. As for the content of the literature review, it would be better to add some information (which was stated above) and make the paper more organized by providing headings for subsections and avoiding repetition. These improvements should increase the level and quality of the literature review.