Detailed answer

Excessive caffeine consumption can dehydrate the skin, leading to a dull and sallow appearance. It can also constrict blood vessels, reducing blood flow and depriving the skin of essential nutrients. Processed foods high in sugar, unhealthy fats, and additives can cause inflammation in the body, which can manifest as sallow skin. These foods also lack essential nutrients required for healthy skin, such as vitamins and antioxidants. To improve sallow skin, it is advisable to limit caffeine intake and opt for a balanced diet rich in fruits, vegetables, whole grains, and lean proteins.