Dietary Patterns and Skin Ageing / Rejuvenation
Dietary patterns can significantly influence skin aging and rejuvenation. Several studies have explored the impact of various nutrients and dietary components on skin health, and here is a summary of some key findings:
Antioxidants are crucial in protecting the skin from oxidative stress caused by free radicals, which can contribute to skin aging. Diets high in fruits, vegetables, nuts, and seeds, which are rich in antioxidants like vitamins C and E, carotenoids, and polyphenols, have been associated with improved skin health and reduced signs of aging.
Omega-3 fatty acids
Consuming omega-3 fatty acids, found in fatty fish (e.g., salmon, mackerel) and flaxseeds, may help maintain skin barrier function, reduce inflammation, and support overall skin health.
Collagen is essential for maintaining skin elasticity and firmness. Nutrients like vitamin C, which is involved in collagen synthesis, and amino acids like proline and glycine, which are building blocks of collagen, can be beneficial for skin rejuvenation. Citrus fruits, leafy greens, and bone broth are examples of foods that support collagen production.
Dietary collagen has been a topic of interest in the field of skin rejuvenation. Several studies have investigated the effects of collagen supplementation on skin aging and overall skin health.
A systematic review and meta-analysis by Miranda et al. (2021)  found that hydrolyzed collagen supplementation demonstrated functional and beneficial effects on the skin, particularly in improving the clinical signs of skin aging. The study highlighted that the age-dependent reduction in collagen synthesis can be reversed by the oral administration of bioactive collagen peptides. Similarly, a review article by Jhawar et al. (2019)  discussed the popularity of oral collagen supplements in the world of skin health. These supplements have been marketed for their purported benefits in wrinkle reduction, skin rejuvenation, and skin plumping. However, the authors noted that there are currently limited data available in the literature, and much regarding the effects of oral collagen supplementation on the skin is yet to be fully understood.
In addition to collagen supplementation, other approaches to skin rejuvenation have also been explored. For example, the use of platelet-rich plasma (PRP) has gained popularity in dermatology for achieving skin rejuvenation. Kassir et al. (2020)  discussed the use of autologous PRP in dermatology and its mechanism of action in increasing dermal fibroblast proliferation and collagen synthesis.
Furthermore, a study by Kim et al. (2018)  investigated the potential rejuvenating effects of conditioned media from human umbilical cord blood-derived mesenchymal stem cells (hMSCs) on human skin. The study hypothesized that hMSCs could produce rejuvenating factors that attenuate skin aging, including collagen synthesis.
While the focus of this synthesis has been on collagen supplementation, it is important to note that other factors, such as growth factors and cytokines, also play a role in skin rejuvenation. Aldag (2016)  discussed the use of cosmetic products containing growth factors and cytokines to promote collagen and elastin synthesis for skin rejuvenation.
Overall, the available evidence suggests that dietary collagen supplementation, particularly in the form of hydrolyzed collagen peptides, may have beneficial effects on skin aging and rejuvenation. However, more research is needed to fully understand the mechanisms of action and determine the optimal populations for treatment with collagen supplements.
Staying adequately hydrated is essential for maintaining skin moisture and elasticity. Dehydration can lead to dry, dull-looking skin, while proper hydration can help achieve a more radiant appearance.
Sugar and refined carbohydrates
High sugar and refined carbohydrate intake can contribute to a process called glycation, which damages collagen and elastin fibers, leading to premature aging and wrinkles. Reducing the consumption of sugary and processed foods may benefit skin health.
The Mediterranean diet, rich in fruits, vegetables, whole grains, olive oil, and fish, has been associated with reduced skin aging. Its anti-inflammatory and antioxidant properties may help protect the skin from damage caused by environmental factors.
It is essential to note that while dietary patterns can influence skin aging and rejuvenation, other factors, such as genetics, sun exposure, skincare routine, and lifestyle habits, also play significant roles in maintaining youthful skin.
- Miranda, R., Weimer, P., & Rossi, R. (2021). Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta‐analysis. International Journal of Dermatology, 60(12), 1449-1461. 
- Jhawar, N., Wang, J., & Saedi, N. (2019). Oral collagen supplementation for skin aging: a fad or the future?. Journal of Cosmetic Dermatology, 19(4), 910-912. 
- Kassir, M., Kroumpouzos, G., Puja, P., Katsambas, A., Galadari, H., Lotti, T., … & Goldust, M. (2020). Update in minimally invasive periorbital rejuvenation with a focus on platelet‐rich plasma: a narrative review. Journal of Cosmetic Dermatology, 19(5), 1057-1062. 
- Kim, Y., Seo, D., Lee, S., Lee, S., An, G., Ahn, H., … & Kang, K. (2018). Conditioned media from human umbilical cord blood-derived mesenchymal stem cells stimulate rejuvenation function in human skin. Biochemistry and Biophysics Reports, 16, 96-102. 
- Aldag, C. (2016). Skin rejuvenation using cosmetic products containing growth factors, cytokines, and matrikines: a review of the literature. Clinical Cosmetic and Investigational Dermatology, Volume 9, 411-419.