Low FODMAP on a Budget: 7-Day $75 Meal Plan With Grocery List

By the Caullie team · Published July 17, 2026 · Prices checked at Walmart, July 2026 (national prices; vary by store)

Low FODMAP already asks a lot of your kitchen — cutting onion, garlic, wheat, and high-FODMAP produce doesn't leave much room to also overspend on groceries. It affects roughly 12% of people in the United States through IBS, per the NIH, and most of them are doing this while also paying rent and buying gas. This plan skips the specialty aisle entirely: it's built on chicken, eggs, and canned tuna — proteins that are naturally low FODMAP with no serving limit — plus rice, potatoes, and produce at their verified Monash-safe portions.

Seven days, one grocery list, about $75 at Walmart, and per-meal calories so you're not guessing. Every ingredient is priced below, every calorie traces back to a USDA source, and every portion size that matters is called out explicitly — because on this diet, the food list is only half the rule; the other half is how much of it you eat.

What "low FODMAP" means for this plan

FODMAPs are fermentable carbohydrates that trigger IBS symptoms in people who are sensitive to them. The Monash University protocol that identified them runs in three phases: a strict elimination phase of 2–6 weeks, a structured reintroduction phase testing one FODMAP group at a time, and a personalization phase where you keep everything you tolerate. Monash is direct about the first phase: it's "just 2–6 weeks — it is not a diet for life." This plan is built for that window. One thing worth knowing up front if you're wondering why this plan leans on gluten-free pasta: wheat's problem on low FODMAP is fructans, not gluten, so a small amount of wheat is fine by portion — going gluten-free here is just a shortcut that sidesteps counting wheat servings, not a dietary requirement.

Chicken, tuna, and eggs: the budget backbone

Plain animal protein is the easiest category on this entire diet. Monash's own guidance on meat, seafood, and eggs is unambiguous: "they are naturally low FODMAP!" — no measuring cup required. That's the whole reason this plan can hit $75: chicken breast, eggs, and canned tuna are cheap per gram of protein and none of them count against a serving limit the way legumes or produce do. Two caveats from the same source matter for shopping: buy plain or unseasoned meat, since "marinated meats may contain high FODMAP ingredients, such as garlic, honey and applesauce," and for canned fish, stick to "unflavoured, canned fishes, such as tuna and salmon" — the flavored pouches often aren't. This plan uses plain frozen chicken breast and canned tuna in water, unflavored, exclusively. If you're building a meat-free week instead, our low FODMAP vegetarian meal plan covers the same elimination phase with tofu, eggs, and portioned legumes.

The ~$75 grocery list (Walmart, July 2026)

Store-brand (Great Value) where it exists. Prices are from walmart.com listings checked in July 2026 — treat them as estimates; they vary by store and season. The chicken comes from a 5 lb frozen bag; this list allocates the roughly 3.5 lb used across the week's meals at the bag's per-pound price, with the rest carrying into week two.

Assumes pantry salt, pepper, and dried herbs (oregano and basil are low FODMAP-friendly). Meals skip onion and garlic by design, the way the whole elimination phase does. Notes on estimated/carryover items: the 5 lb chicken bag, canned lentils, rice, oats, rice cakes, olive oil, peanut butter, and maple syrup are all bought in package sizes larger than one week uses, so a portion carries into week two — that's reflected honestly in a lower cost next time you shop. Walmart prices are estimates that can vary by store and week.

Batch-cook these on day one (about 60 minutes)

• Roast or pan-sear about 2 lb of chicken breast: season with just salt, pepper, and olive oil — no marinade — and cook through. Slice half for bowls, cube the rest for the soup and stir-fry later in the week.
• Pot of rice (3 cups dry) to cover four separate meals.
• Roast a tray of potatoes (about half the 5 lb bag, cubed, tossed in oil) for hash, baked-potato dinners, and sides.
• Hard-boil 3–4 eggs for snacks and egg salad later in the week.

Buy the canned lentils rinsed and drained straight from the can — canning leaches most of the FODMAPs into the liquid, which is why a ¼-cup (about 46 g) serve is low FODMAP even though dry-cooked lentils in larger amounts aren't, per Monash's legume guidance.

The 7-day plan (~1,400–1,600 calories/day)

Calories are approximate, computed from USDA FoodData Central entries — chicken breast, roasted (~165 kcal/100 g), white rice, cooked (~205 kcal/cup), egg, large (~72 kcal each), banana (~105 kcal medium), peanut butter (~191 kcal/2 tbsp), lentils (~58 kcal/¼ cup), strawberries (~21 kcal/65 g serve), oranges (~47 kcal/100 g), rolled oats (~389 kcal/100 g dry), carrots (~41 kcal/100 g), and olive oil (~119 kcal/tbsp). Canned tuna and green beans have wider ranges across sources, so meals with them are marked "approx." and rounded conservatively. Targets one moderately active adult — treat it as a starting point and scale to your own goal.

Day totals run about 1,410–1,530 calories with this plan, all within the stated range once you sum the meals — adjust portions up or down for your own target.

Portion watch-outs: it's not just the food list

The most expensive mistake on a low FODMAP budget isn't buying the wrong food — it's eating the right food in the wrong amount. Several ingredients in this plan are only low FODMAP up to a specific serving, and Monash updates these thresholds as foods get re-tested:

Serving sizes reflect current Monash University-sourced guidance as of July 2026 via the dietitian sources linked above. Thresholds can shift as foods are re-tested — worth a periodic check if you're eating this way for more than a few weeks.

Easy swaps

Is meat really safe on the low FODMAP diet?

Yes, and it's the easiest category on the whole diet. Monash's guidance states plainly that plain meat, poultry, fish, and eggs "are naturally low FODMAP" — FODMAPs are carbohydrates, and protein and fat simply don't carry them, so there's no serving cap to track the way there is with produce or legumes. The catch is what gets added to the meat before it reaches your plate. Marinades, rubs, and pre-seasoned packages often include garlic, onion, honey, or applesauce — all high FODMAP — so the safe move is buying plain cuts and seasoning them yourself with salt, pepper, and low FODMAP herbs. The same logic applies to canned fish: plain tuna or salmon packed in water is safe, but "flavored" pouches can carry the same hidden ingredients. This plan sticks to plain frozen chicken breast and unflavored canned tuna throughout.

Why do "safe" foods like tomatoes and peppers still need portion limits?

Because FODMAP content is a dose question, not a yes-or-no one. A food can contain a fermentable carbohydrate that's harmless in a small amount and symptom-triggering in a larger one — which is exactly what Monash's testing found with roma tomatoes (safe around half a tomato, not unlimited) and red bell pepper (safe around ⅓ cup, not a whole pepper). It's also why a firm banana is fine whole while a ripe one only works in a third-sized piece: ripening itself changes the carbohydrate content. This is the part of the diet that store-bought "low FODMAP" food lists tend to flatten into a simple yes/no, and it's also why grocery budgeting for this diet is really portion budgeting — buying two red peppers for a week of garnish-sized servings costs less and keeps you further from your symptom threshold than buying a stack of them for a stir-fry base.

How long should I eat this way?

Two to six weeks, then you move on. Monash designed the strict elimination phase to be short and is explicit that it's "not a diet for life" — after your symptoms settle, the next phase is reintroduction, testing one FODMAP group at a time to find your actual triggers, followed by a personalized long-term diet that's far less restrictive than this one. Staying in strict elimination longer than necessary doesn't add benefit and can make your diet unnecessarily narrow. If you're also managing your weight during this stretch, it's worth thinking about calories and FODMAP restriction as two separate goals rather than combining them into one aggressive cut — our guide on whether you can lose weight on the low FODMAP diet covers how to do both without undermining the elimination phase.

This article is about meal logistics and cost, not medical care, and is not medical advice. The low FODMAP diet should ideally be undertaken with guidance from a doctor or registered dietitian, particularly the reintroduction phase. FODMAP serving sizes reflect Monash University guidance as of July 2026 via the sources linked above and can change as foods are re-tested. Calorie figures are approximate, derived from the USDA FoodData Central entries linked above; canned tuna and green beans are rounded conservatively due to source variation. Prices are walmart.com listing estimates from July 2026 and will vary by store and season.