Nutrition: Before and After Surgery.

Nutrition Before and After Surgery: What You Need to Know for a Better Recovery.

Nutrition plays a key role in surgical safety and the speed of recovery after surgery. Eating properly before and after a procedure can reduce complications, improve wound healing, and help you regain strength more quickly.
In this article, we explain what to eat, when, and why—based on current medical evidence.

Why Is Nutrition So Important in Surgery?

During surgery, the body enters a state of metabolic stress: inflammation increases, energy expenditure rises, and more protein is required to repair tissues. Poor nutrition is associated with a higher risk of infections, delayed healing, and longer hospital stays.

1. Days Before Surgery

In the days or weeks leading up to surgery, it is recommended to:

• Consume enough protein (chicken, fish, eggs, legumes, yogurt)

• Maintain a balanced and light diet, avoiding excess fat and alcohol

• Stay well hydrated daily

In patients with malnutrition or those undergoing major surgery, preoperative nutritional support may be recommended to reduce risks.

2. Fasting Before Surgery: What Current Evidence Says

Contrary to the old belief of “no food after midnight,” modern guidelines indicate:

• Solid foods: up to 6 hours before surgery

• Clear liquids (water, tea, coffee without milk): up to 2 hours before surgery

In some cases, a carbohydrate-rich drink 2–3 hours before surgery is recommended to reduce fatigue and insulin resistance.

Always follow the specific instructions provided by your surgeon or anesthesiologist.

1. Resume Eating as Soon as Possible

Current protocols recommend restarting oral intake within the first 24 hours after surgery, as long as there are no medical contraindications. This helps speed recovery and reduces complications.

2. Key Nutrients for Recovery

Protein: The Most Important Nutrient

• General recommendation: 1.2 to 2 g of protein per kg of body weight per day

• Supports wound healing, preserves muscle mass, and strengthens the immune system

Recommended sources:

• Fish, chicken, eggs

• Dairy products

• Legumes

• Protein shakes (especially if appetite is low)

Hydration

• Essential to prevent constipation, fatigue, and dehydration

• Prefer water, clear broths, and mild herbal teas

Vitamins and Fiber

• Fruits and vegetables provide vitamin C, zinc, and antioxidants essential for healing

• Fiber helps prevent constipation caused by anesthesia and pain medications

3. Diet Progression

Depending on the type of surgery, the diet may progress as follows:

• Clear liquids

• Soft or bland diet

• Regular diet

In many non-digestive surgeries, this progression can be rapid—even on the same day.

Consult your doctor if you experience:

• Persistent nausea

• Complete loss of appetite for several days

• Rapid weight loss

• Difficulty eating or drinking

Each patient is different, and nutrition should be tailored to individual needs.

Proper nutrition before and after surgery can make the difference between a slow recovery and a favorable outcome. Having a medical team that guides you at every stage is essential for your safety and well-being.