Systemic Sclerosis DIet for GastrointESTinal Symptoms

Inclusion Criteria:

* Diagnosis of systemic sclerosis (SSc) as per ACR/EULAR classification criteria

  .• Self-reported moderate to severe gastrointestinal bloating or distension, with a UCLA SCTC-GIT 2.0 bloating Scale score ≥2.00 on (0.00-3.00 scale) at screening.
* Willingness and ability to comply with dietary intervention and study procedures.
* Ability to provide informed consent.

Exclusion Criteria:

* Diagnosis of inflammatory bowel disease (Crohn's disease or ulcerative colitis) or celiac disease.
* Use of systemic antibiotics within 4 weeks prior to baseline.
* History of gastrointestinal surgery (other than cholecystectomy or appendectomy unless in the last 3 months).
* Severe cognitive impairment or psychiatric illness that would limit ability to follow dietary instructions.
* Known allergy or intolerance to major components of any of the study diets (e.g., lactose, gluten) unless manageable within diet framework.
* Current or recent (within 3 months) dietary intervention for managing GI symptoms (e.g. gluten-free diet, low FODMAP diet, etc.).
* Clinically significant self-reported (≥10 percent weight loss) in the last 3 months
* BMI less than 20
* Ongoing tube feeds or TPN
* Participating in another interventional trial
* Pregnancy or lactation, or planning pregnancy in the next 6 months