Feeling puffy after meals isn’t always about salt or fizz; sometimes, your vitamins are sending signals. Small gaps in nutrients like D and key Bs can shift gut motility, weaken the lining, and stir up gas. This guide explains what’s known, what’s speculative, and how to investigate safely. You’ll learn simple food swaps, smart tests to request, and when supplements make sense. If bloating lingers, these clues can help you move from guesswork to a plan.