Neither Arby’s nor McDonald’s is a health food restaurant, but Arby’s flagship sandwich does come out ahead on paper. The Classic Roast Beef has 360 calories and 14 grams of fat, while the Big Mac hits 580 calories and 34 grams of fat. That said, the full picture depends on what you order, how much sodium you can tolerate, and what matters most to you nutritionally.
Flagship Sandwiches: A Direct Comparison
The most fair comparison is each chain’s signature item. Arby’s Classic Roast Beef versus McDonald’s Big Mac tells a clear story:
- Calories: 360 (Arby’s) vs. 580 (McDonald’s)
- Total fat: 14g vs. 34g
- Saturated fat: 5g vs. 11g
- Sodium: 970mg vs. 1,060mg
- Protein: 23g vs. 25g
Arby’s wins on calories and fat by a wide margin while delivering nearly the same amount of protein. Sodium is high at both places, though McDonald’s edges slightly worse. If you’re counting calories, that 220-calorie gap is significant, roughly the equivalent of a second small side item.
Of course, the Big Mac is a larger, sauce-heavy sandwich, so the comparison isn’t perfectly apples-to-apples. McDonald’s plain Hamburger clocks in at just 250 calories, which undercuts even the Roast Beef Classic. The lesson: the specific item you choose matters more than which building you walk into.
Sodium Is High at Both Chains
Sodium is where both restaurants struggle. The daily recommended limit is 2,300 milligrams for most adults, and a single Arby’s Classic Roast Beef already accounts for 42% of that. The Big Mac takes up 46%. Order a combo meal with fries and a drink at either chain and you’ll likely blow past half your daily sodium budget in one sitting.
Arby’s “Market Fresh” items sound healthier, but they can be sodium traps. The Roast Beef Gyro, for example, packs 1,300 milligrams of sodium alongside its 540 calories. Bigger portions and added sauces tend to push sodium up fast regardless of the chain. Arby’s Premium Nuggets also rank among the highest-sodium nugget options across major fast food chains, while McDonald’s nuggets score comparatively better on sodium.
What’s Actually in the Meat
One area where both chains do reasonably well is their core proteins. McDonald’s beef patties contain 100% USDA-inspected beef with no fillers or extenders, seasoned only with salt and black pepper. Arby’s roast beef is similarly simple: beef, water, salt, and sodium phosphates. No nitrates, no carrageenan, no long list of preservatives.
The story changes with other Arby’s meats. Their ham, corned beef, and bacon all contain sodium nitrite, a common curing agent linked to health concerns when consumed regularly. Arby’s roast turkey avoids nitrites but does include modified food starch and dextrose. If you’re trying to minimize additives, sticking to the plain roast beef at Arby’s or a basic burger at McDonald’s keeps the ingredient list shortest.
Lowest Calorie Options at Each Chain
If you’re actively trying to eat light, your best bets look different at each restaurant.
At Arby’s, the Classic Roast Beef at 360 calories is the most nutritious main menu item. A three-piece order of chicken tenders or a side salad can also work as lower-calorie choices. The roast turkey gyro is decent but jumps to 540 calories and 29 grams of fat once the tzatziki sauce and pita are factored in.
At McDonald’s, the plain Hamburger at 250 calories is the leanest option and one of the lowest-calorie entrees at any major fast food chain. A Cheeseburger runs about 300 calories. These simpler items keep fat and sodium lower than anything with special sauces or multiple patties.
The pattern at both chains is the same: the smaller, simpler items are dramatically healthier than the premium sandwiches. A McDonald’s Hamburger has less than half the calories of a Big Mac. Arby’s Classic Roast Beef has roughly two-thirds the calories of their Roast Beef Gyro.
Gluten-Free and Allergen Options
If you need to avoid gluten, McDonald’s offers slightly more flexibility. You can order any burger wrapped in lettuce instead of a bun, and several salads and dessert items (like the McFlurry with M&M’s) are gluten-free. Cross-contamination is still a real risk given the pace of fast food kitchens.
Arby’s gluten-free options are extremely limited. Most of their meats, including the angus steak, corned beef, and brisket, are gluten-free on their own, but there’s no standard lettuce wrap option to replace the bread. Their fries are technically gluten-free but cooked in shared oil with gluten-containing items. Your best complete meal at Arby’s if you’re avoiding gluten is the roast turkey farmhouse salad.
The Bottom Line on Both Menus
Arby’s has a slight nutritional edge at the flagship level. Fewer calories, less fat, and a simple ingredient list for their core roast beef give it a measurable advantage over the Big Mac. But McDonald’s fights back with its plain Hamburger, which is one of the lowest-calorie fast food sandwiches available anywhere, and better gluten-free accommodations.
The real variable is your ordering habits. A Classic Roast Beef with water is a genuinely moderate meal at around 360 calories. A Beef ‘n Cheddar with curly fries and a shake is not. The same split exists at McDonald’s between a plain Hamburger and a Big Mac combo. At either chain, the gap between the best and worst choices on the menu is far larger than the gap between the two restaurants.