Five Guys fries are not considered a healthy food choice by most nutrition standards — they're high in calories, fat, and sodium, though they are made from real potatoes cooked in peanut oil without artificial preservatives.
A regular order of Five Guys fries contains roughly 950-1,300 calories (a "little" order is around 620, but portions are notoriously large and often served heaping over the cup), with 60-70+ grams of fat and over 1,000 mg of sodium, depending on serving size. The "large" size, which many people default to, can approach or exceed a full day's recommended fat and sodium intake in a single serving. This is significantly more than a typical fast-food fry portion from competitors, partly because Five Guys is known for oversized servings.
On the positive side, Five Guys fries are cooked in 100% peanut oil, which is free of trans fats and considered a somewhat healthier frying oil compared to partially hydrogenated oils used elsewhere. The company also markets its fries as made from fresh-cut potatoes with no artificial additives, and the ingredient list is relatively simple: potatoes, peanut oil, and salt. This means the "junk factor" from preservatives or synthetic ingredients is lower than in many processed fast foods.
That said, "less processed" doesn't equate to "healthy" in a calorie or macronutrient sense — the fries are deep-fried, calorie-dense, and high in sodium and fat, which are the main concerns for people watching heart health, weight, or blood pressure. Someone with a peanut allergy should also avoid them entirely due to the peanut oil.
If enjoying them occasionally, splitting an order, choosing a smaller size, or treating fries as a shared side rather than a personal portion can help fit them into a balanced diet. As with most fried fast food, moderation is the key factor rather than viewing them as a health food.