What Colorectal Surgery Asks of Your Body

Colorectal surgery is different from many operations because recovery isn't only about the incision healing — it's about your gut getting back to work, your immune system holding strong, and your body keeping its strength through it all.

Infection risk is a central concern. Because colorectal surgery involves the bowel, guarding against infection and supporting healthy healing of the surgical connection is a major focus — and nutrition plays a direct role in the immune defenses that protect you.

Many patients arrive already depleted. Roughly a third of patients are malnourished on admission for colorectal surgery, and that depletion is tied to more infections, slower healing, and longer hospital stays. Closing those gaps before surgery gives your body a stronger starting point.

Muscle and strength matter for the long haul. For colorectal cancer patients especially, protecting muscle isn't just about recovery — it can affect how well you tolerate chemotherapy afterward. Strength carries through the whole journey.

The encouraging part: colorectal surgery is one of the best-studied areas for nutrition's impact, and these are gaps you can close. With the right support, you can heal better, lower your risks, and keep your strength.

What the Evidence Says

This isn't general wellness advice — it's the specific, published research on colorectal surgery outcomes, much of it from randomized controlled trials.

Nutritional preparation before surgery shortens recovery.

A meta-analysis of colorectal surgery patients found that nutritional prehabilitation — alone or with exercise — shortened hospital stay by about two days. (Gillis et al., Gastroenterology, 2018) In a pilot trial, whey protein supplementation before surgery improved patients' walking capacity going into the operation. (Gillis et al., J Acad Nutr Diet, 2016) And across surgery broadly, a large network meta-analysis of 186 trials found nutritional preparation reduced complications by 38% and shortened hospital stay by about a day. (McIsaac et al., BMJ, 2025)

Immune-supporting nutrition lowers infections after colorectal surgery.

“Immunonutrition” — formulas combining nutrients like arginine, omega-3s, and glutamine — has been studied extensively in colorectal surgery. Meta-analyses have found it meaningfully reduces infectious complications and shortens hospital stay. (Preoperative immunonutrition meta-analyses, 2016–2025) These are the same categories of nutrients that support immune defense and healing.

Carbohydrate loading eases the stress of surgery.

In a randomized trial of colorectal surgery patients, carbohydrate loading before surgery — rather than fasting — significantly reduced insulin resistance and inflammation, eased thirst and hunger, and shortened hospital stay. (Kumar et al., J Gastrointest Surg, 2024)

Protein protects muscle — which matters through chemotherapy.

In a randomized trial of colorectal cancer patients at nutritional risk, those given a high-protein, vitamin-enriched supplement after surgery had more muscle and less sarcopenia (muscle loss) three months later — and, notably, needed fewer reductions or delays in their chemotherapy. (Tan et al., Clin Nutr, 2021)

The thread running through all of it: colorectal surgery is nutritionally demanding, the gaps are often invisible, and addressing them is something within your control — and tied to outcomes that matter, from infections to chemotherapy tolerance.

The Protocol

Thrive Protocol organizes the evidence into one simple, phase-based system — developed by surgeons, with once-daily packets and clear timing. No guesswork, no shelf full of separate bottles.

Phase 1: Prepare (1 week before surgery)

OptiFuel delivers high-quality protein and essential nutrients to help you arrive at surgery as strong and well-nourished as possible — the preparation the colorectal prehabilitation research points to.

Phase 2: Surgery Day

OptiCharge, your pre-op carbohydrate drink, helps your body maintain energy and keep blood sugar in better control around surgery — the same carbohydrate-loading approach that, in colorectal trials, reduced insulin resistance and shortened hospital stay. (Always follow your surgical team's specific fasting instructions.)

Phase 3: Heal

Daily OptiFuel continues through your recovery, built to support healing on multiple fronts:

• Protein and glutamine — to protect muscle and support immune defense and gut healing

• Omega-3s — part of the immune-supporting nutrient family studied in colorectal surgery

• Vitamin C and collagen — to support wound and tissue healing

• Vitamin D — to close a common nutritional gap

• Curcumin to support a balanced inflammatory response

• Magnesium to support muscle function and rest

One formula, targeting the nutrients the colorectal research points to — so you keep your strength through recovery and beyond. Always let your surgical team know what you're taking, especially if cancer treatment is part of your plan.

Get the Surgical Protocol Kit

Ships to your door before surgery day. HSA/FSA eligible.

WANT TO GO FURTHER?

Add the Recovery & Strength Mix to your kit. It brings additional recovery amino acids — including arginine, a key component of the immune-supporting formulas studied in colorectal surgery — plus creatine to help protect muscle and strength. A natural complement to OptiFuel, and especially relevant if you want to round out the immune-nutrition profile. (If cancer treatment is part of your plan, check with your oncology and surgical team first.)

Add Recovery & Strength Mix

Built Into Your Recovery, Not Added On

Thrive Protocol was developed by surgeons to fill a real gap in surgical care — and it's designed to work hand-in-hand with the plan your surgical team already has for you. Surgery treats the problem. Nutrition protects your strength, supports your immune defenses, and helps you heal. Together, that's how modern enhanced-recovery care works.

One packet a day. Mixed into water or a smoothie. Delivered before your surgery date.

You've got enough on your mind. Let the protocol handle the nutrition so you can focus on healing — and keep your care team informed every step of the way.

Frequently Asked Questions

What is “immunonutrition,” and is that what this is?

Immunonutrition refers to nutrition formulas that combine nutrients like arginine, omega-3s, and glutamine to support the immune system around surgery — well studied in colorectal surgery for reducing infections. OptiFuel includes glutamine and omega-3s; for arginine, the Recovery & Strength Mix add-on rounds out that profile. As always, share what you're taking with your surgical team.

I'm having surgery for colorectal cancer — does nutrition matter even more?

In many ways, yes. Research shows protein supplementation helped cancer patients keep muscle after surgery and even needed fewer chemotherapy reductions or delays. Because cancer treatment adds important considerations, coordinate with your oncology and surgical team on what to take and when.

When should I start?

About 1 week before your surgery date, so your body is as well-nourished as possible going in — that's the window the prehabilitation research supports. The protocol then continues through recovery.

Can I use my HSA or FSA?

Yes. Thrive Protocol kits are HSA/FSA eligible, so you can use pre-tax health dollars.

Does this replace what my surgeon told me to do?

Never. Thrive Protocol works alongside your surgeon's instructions. Always follow your surgical team's guidance — especially their fasting instructions before surgery and any bowel-prep instructions, and let them know what you're taking.

Heal Faster. Lower Your Risks. Keep Your Strength.

The weeks around your surgery are an opportunity — and colorectal surgery is one of the areas where the evidence for nutrition is strongest. Give your recovery every advantage, alongside the team guiding your care.

Start Your Thrive Protocol

Developed by physicians. Backed by research. Trusted by patients.