Why You Still Need a Dietitian for Weight Loss Surgery

If you’re planning weight loss surgery, chances are you’ve already seen a dietitian. Maybe a few.

Written by Kate Stoker, Principal Dietitian at Simply Nutrition Dietitians

So when someone says you need to see one again, it can feel repetitive.

But bariatric surgery changes your body in a way that requires a completely different level of nutrition support.

Surgery changes your stomach.

It doesn’t automatically change your habits, food choices, or understanding of nutrition.

I’m Kate Stoker, Principal Dietitian at Simply Nutrition Dietitians. I work with people going through gastric sleeve and gastric bypass surgery every week.

The questions most people ask

• How much will I actually be able to eat?
• What does the pre-op diet really involve?
• How long will I be on fluids?
• What vitamins do I actually need?
• How do I stop the weight coming back?

These are real concerns. Because surgery changes your stomach, but not your routines. That’s why working with a dietitian for weight loss surgery can make such a difference before and after the procedure.

What a dietitian actually does

This isn’t about judgement. Most people already feel frustrated and overwhelmed.

The goal is to give you clarity and a plan that actually works in your day-to-day life. You can learn more about our weight loss surgery dietitian support and how we guide you through each stage.

Before surgery

• Review what you're currently eating
• Identify patterns that impact your progress
• Explain what eating will look like after surgery
• Break down your blood test results clearly
• Create a realistic pre-op plan
• Set up supplements for after surgery

After surgery

This is where most people need the most support.

• Step-by-step guidance from fluids to solids
• Help meeting protein targets
• Simple food options so you’re not guessing
• Ongoing monitoring and adjustments
• Support with long-term habits

Why this matters long term

Without the right support, people often struggle with:

• Protein deficiencies
• Vitamin deficiencies
• Fatigue
• Hair loss
• Weight regain

You don’t need perfection. You need structure, guidance, and support that fits your life.

Need support with weight loss surgery?

Learn more about our support before and after bariatric surgery.

Learn more about weight loss surgery dietitian support