Which of the following categories influences one's body image?

The influence of personal perceptions of one's body on body image is significant because it encompasses how individuals view and feel about their own physical appearance. These perceptions are shaped by a variety of factors, including self-esteem, past experiences, and societal standards for beauty. When a person has a positive personal perception, it can lead to a healthier body image, whereas negative perceptions can lead to issues such as dissatisfaction and low self-esteem.

The other categories also play roles in shaping body image but are often more indirect or influenced by personal perceptions. Knowledge of fitness training can provide individuals with tools and strategies for improving their physical health and can enhance self-esteem, but it does not directly shape how someone perceives their body. Social media presence can significantly impact body image through comparisons with others; however, the impact is mediated by individual perceptions. Dietary restrictions may affect physical appearance and health, but they don't inherently define how someone feels about their body. Thus, personal perceptions are at the core of body image influence, making this choice the most accurate in this context.