Understanding Adherence to Supplement Intake After Bariatric Surgery 

Understanding Adherence to Supplement Intake After Bariatric Surgery 

Bariatric surgeryWritten by Ingrid Kruizinga

Medical Affairs Specialist

Lifelong multivitamin supplementation is a cornerstone of care after bariatric surgery. Clinical guidelines consistently emphasize its importance to prevent micronutrient deficiencies that can lead to anemia, bone disease, neurological complications, and long-term morbidity. Yet despite clear recommendations, real-world adherence remains disappointingly low.

This gap between prescription and practice is not new, but understanding why patients discontinue supplements is essential if we want to close it. A large body of research has focused on biochemical deficiencies and optimal dosages, but far less attention has been paid to the patient experience itself. That is precisely where the work of Smelt and colleagues offers critical insight.

What Patients Tells Us About Non-Adherence 

In their multicentre survey study, Smelt and colleagues explored factors influencing adherence to multivitamin supplementation from the patient’s perspective. The findings make one thing clear: non-adherence is rarely about indifference or unwillingness. Instead, it is driven by a combination of physical discomfort, practical barriers, and experiential factors that accumulate over time.

Among patients who had stopped taking their supplements, more than half reported gastrointestinal complaints directly related to multivitamin use. Nausea stood out as the most dominant symptom, reported by 85.4% of those experiencing GI-related problems. Other complaints included abdominal discomfort, reflux, bloating, and vomiting.

Beyond gastrointestinal symptoms, sensory characteristics of supplements played an important role. Unpleasant taste and smell were frequently mentioned and often contributed to the gastrointestinal complaints.

A Multifactorial Problem

The study also highlights that supplement adherence is shaped by more than physiology alone. Pill burden, formulation size, cost, and lack of tailored guidance from health care professionals all interact with postoperative changes in eating behaviour and gastrointestinal sensitivity.

Why this matters 

Micronutrient deficiencies after bariatric surgery are not benign. When patients stop taking supplements, deficiencies may remain silent for years before manifesting clinically. By the time symptoms appear, damage may already be done.

The work by Smelt and colleagues underscores the need to move beyond what we prescribe and pay closer attention to how supplements are taken and experienced.

But identifying the problem is only the first step.

If nausea, GI complaints, and sensory triggers are key drivers of non-adherence, the next question becomes obvious:

Can we reduce these symptoms in a practical, low-threshold way and thereby support long-term adherence?

That question is explored in the next article, which focuses specifically on nausea related to multivitamin use and evaluates whether structured intake instructions can make a meaningful difference in daily practice.

Clinical Implications

  • Poor multivitamin adherence after bariatric surgery is common and largely driven by tolerability issues rather than lack of motivation.
  • Gastrointestinal complaints, especially nausea, are the most frequently reported reasons for discontinuation.
  • Non-adherence should be approached as a clinical signal, not a patient failure.
  • Addressing how supplements are taken may be just as important as what is prescribed.

Would you like to learn more about this research study?

Simply contact us using the button below:

Contact us

Related articles: