Diet soda and sugar soda

Diet soda usually reduces calorie intake compared with sugary soda, but its effects on hunger and metabolism may vary; sugary soda adds calories and was linked to substantially greater weight gain in a six-month comparison. 1

• Diet soda and appetite: Some evidence suggests sweet taste or learned pairings with food can increase hunger or insulin responses in some people, especially when diet soda is consumed with food. But controlled trials overall found that replacing regular soda with low-calorie drinks supported weight loss. 2 3
• Gut microbiome and metabolism: Non-nutritive sweeteners may affect gut bacteria and metabolism in susceptible individuals, though effects differ by sweetener and study. 4 5
• Replacing sugary soda: Switching from regular soda to diet drinks can reduce calorie intake and support weight loss; in one example, replacing five colas daily with diet soda was estimated to save 750 calories. 6 7
• Alternatives: Black coffee, yerba mate tea, or drinks with ketones were mentioned as alternatives; diet soda was described as an occasional choice. 8