French fries are a universal favorite, but some fast-food fries are far worse for your health than others. High in calories, fat, and sodium, these fries can quickly exceed daily dietary limits. We have ranked the six unhealthiest fast-food fries based on nutrition analysis, helping you identify which sides to skip.
Fatburger – Skinny Fries

Despite the “skinny” label, Fatburger’s fries are calorically dense and heavy in fat. Sodium levels are high, making them a hidden risk when paired with burgers or fried chicken.
Sonic – Medium Fries

Sonic’s medium fries absorb oil quickly, leading to higher fat content. Coupled with nearly 1,000mg of sodium, these fries exceed daily dietary limits and can impact heart health if consumed frequently.
Jack in the Box – Medium Fries

Bahnfrend, CC BY-SA 4.0, via Wikimedia Commons
Jack in the Box fries are similar to Sonic and Fatburger, with high fat and sodium in a medium serving. They are deceptively simple but nutritionally heavy, making moderation critical.
Shake Shack – Regular Fries
Shake Shack crinkle-cut fries are crisp and flavorful, but a single serving provides nearly a third of the recommended daily sodium. Their fat content also contributes to cardiovascular risk, making them one of the unhealthiest options.
Carl’s Jr. – Medium Natural Cut Fries
Natural-cut fries may appear healthier, but Carl’s Jr.’s fries remain high in calories, fat, and sodium. They are a deceptively indulgent choice for anyone monitoring nutritional intake.
KFC – Secret Recipe Fries

ChanisCaucasi, CC BY 4.0, via Wikimedia Commons
KFC’s Secret Recipe fries are moderate in calories but pack a surprising amount of sodium. A medium serving contains nearly half the recommended daily sodium intake, making these fries a hidden dietary hazard.
