Alcohol

Alcohol is a gut stimulant that will take control of the digestive system rapidly – causing bloating, nausea, abdominal distention, and pain. Due to the addition of carbonation, soda-based cocktails can worsen these symptoms. Individuals with and without IBS can consume alcohol only in moderation, and the former may sometimes enjoy distilled spirits such as vodka, scotch, gin, bourbon and rye. Wine is less likely to cause gastrointestinal problems.

Alcohol blends carbonation and gluten with alcohol and maybe the worst option.