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Gastric Bypass Diets

First 2 weeks or until initial post-op visit: CLEAR LIQUID DIET

  • Water, tap, bottled, flavored but without added
  • Tea, Crystal Light, Sugar-Free Kool-aid
  • Apple Juice, white grape juice, cranberry juice diluted to 50/50 with water
  • Sugar Free Popsicles or Sugar Free Gelatin ("jello")
  • Chicken Broth, Beef Broth, Vegetable Broth, (no particles)
  • Boost Breeze Protein Supplement (clear, not milky)



Day 15-30 - Full Liquids

  • Cream or Tomato Soup, canned only (none from restaurants)
  • Skim Milk of Non-Fat Lactose-Free Milk (EG, "Lactaid", "Dairy-Ease")
  • Non-Fat Sugar-Free Yogurt, plain or Fruit flavored
  • Sugar Free Pudding
  • Apple Sauce
  • Chicken Broth, Beef Broth, Vegetable Broth, (no particles)
  • Boost Breeze Protein Supplement (clear, not milky)

PROTEIN SUPPLEMENT (see list of suggested supplements, 60g/ day of protein)



Week 5 - Mushy Foods

Start out with anything you can BLENDERIZE to the consistency of baby food.
  • Meat, peas, beans, vegetables, fruit
  • Cottage Cheese
  • Mashed potatoes
  • Scrambled Eggs

As the month continues, advance to soft well cooked meats, ground meats, vegetable, canned fruit, rice, pasta, bread.


Week 9 - Regular Diet

Gradually add one at a time:
  • Meat well cooked to easily digested texture cut up in very small pieces 
  • Low fiber vegetables: green beans, beets, carrots, mushrooms, zucchini, and eggplants
  • Food should be low in sugar and fat
  • Can add bread, rice, pasta, potatoes, non-crunchy cereals, soft crackers
  • Avoid whole grains, nuts and seeds, high fiber fruits or vegetables
  • Avoid fried foods and very spicy foods
  • Avoid gas producing foods such as broccoli, cabbage, dried peas or beans, cauliflower, greens, peppers, brussel sprouts
  • Avoid high fat crunchy snacks such as chips, pretzels, popcorn

Take chewable multivitamins with minerals including iron and calcium or a vitamin B-12 shot monthly.

Gastric Bypass Diet: Behavior Modification

  • Eat meals very slowly, taking  approximately 30 minutes to eat
  • Remember: your stomach is the size of an egg and holds less than 1/2 cup volume
  • Chew food 25-30 times each bite
  • Remember: swallowing foods not chewed properly can block the opening of the pouch and cause vomiting and discomfort
  • Use very small plates at home: a bread plate is perfect
  • Do not eat on the run or nibble while cooking
  • Measure all your food in a 1 oz. medicine cup or 1/4 cup (2 oz)
  • Take small bites; use a baby spoon or chopsticks to help you
  • Use calorie-free fluids and beverages throughout the day
  • Remember: You need 8-10 8 oz. glasses (64-80 oz/day)
  • Wait at least 30 minutes before or after a meal before drinking
  • Introduce solid foods one at a time
  • Remember: Food tolerances vary with each patient
  • Take all of your recommended supplements each day
  • Foods Which May Be Difficult To Tolerate:
  • Beef, chicken or turkey; fibrous vegetables such as corn, celery; Bread, Lettuce, Spicy Foods such as chili; Milk, Fried Foods

Gastric Bypass Diet: Meals

  • 3 oz. solid food x 3 meals/day
  • 1 oz. Protein: fish, chicken, turkey, veal, lamb, beef
    • Size of ping-pong ball or 1 inch cube
    • Cut into small pieces, ground or part of a pattie
  • 1-2 Tbsp. Vegetables (1-2 bites)
  • 1-2 Tbsp. Starch (1-2 bites)

Sample Breakfast Meal Plans

  • 1 poached, small soft/hard boiled, fried or scrambled egg;  1/2 sl bread w/ 1 tsp low sugar jelly
  • 1/2 frozen waffle with spray margarine and sugar-free syrup

Sample Lunch Meal Plans

  • 1/4 cup tuna; 4 baby carrots; 3 thin red delicious apple slices
  • 1/2 turkey sandwich with 1 oz turkey; 6 grapes
  • 1/2 c. salad with 1 oz. grilled chicken; 1 T. ranch dressing; 1/2 roll
  • 1/2 peanut butter sandwich; 3 slices granny smith apple
  • 1/2 grilled cheese sandwich; 2 slices tomato
  • 1/3 c. chili with meat and beans; 12 oyster crackers

Sample Dinner Meal Plans

  • 1/2 (1oz) baked chicken thigh; 2 T. cooked spinach; 2 T. baked potato
  • 1/3(1 oz) thin grilled pork chop; 2 T. applesauce; 2 T. corn
  • 1/2 small (1oz) baked fish filet with 1 T. salsa; 2 T. rice; 2 T. peas
  • 1/4 c. spaghetti with 2 T. marinara sauce; 1/2 small slice garlic bread
  • 1/3 c.hamburger helper; 2 T. cooked carrots
  • 1/3c. mostaccioli; 2 T. green beans

Things to Remember

  • Eat only 3 times per day and space your meals every 5 hours
    • Example: Breakfast at 8:00am, Lunch at 1:00pm and Dinner at 6:00pm
    • This will allow you plenty of opportunity to drink fluids between meals
  • Eating too much food will cause discomfort and can stretch your stomach; when this happens, your weight loss drastically slows down.
  • A weight loss of 2-4 lbs per week is quite appropriate; regular exercise will help you continue this rate of weight loss for many months, allowing you to lose up to 100-150 lbs during the first year.


  • 1200 mg Calcium Citrate each day (2 Ultra Tums OK)
  • 500-1000 mcg oral B12 or sublinqual B12 each day
  • 325mg ferrous fumerate, crushable tablets with Vit C once/week, esp females still menstruating
  • Chewable Flinstones 2/day or Vista Vitamin capsules 4/day
  • B complex after the first 6 months
  • Flax Seed Oil 1-2 capsules/day
To prevent hair loss:
  • Zinc lozenges with Vitamin C (zinc oxide and gluconate)(20mg elemental zinc/lozenge)
  • Biotin, small crushable tablets 300mcg or 600 mcg/tablet
Suburban Surgery Center
1950 N. Harlem Ave, Elmwood Park, IL 60707
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