A Miami Consumer’s Guide to Diet Sunkist, Diet Arnold Palmer, Diet Coke, and Coke Zero

Zero sugar doesn’t mean zero consequences — here’s what the ingredients and the science actually say.

Miami runs on iced drinks — at the gym, in the car, between meetings, and on hot afternoons that never seem to end. But if you’re drinking “diet” beverages every day, the real question isn’t calories. It’s what long-term exposure to sweeteners, acids, and additives does to your body.

We compared four of the most popular options Miamians reach for:

  • Diet Sunkist Orange

  • AriZona Diet Arnold Palmer (Half & Half)

  • Diet Coke

  • Coca-Cola Zero Sugar

Let’s look at what’s really inside — and which one is the smartest daily habit.

What’s in each drink

Diet Sunkist Orange

Uses aspartame and acesulfame potassium for sweetness. It is zero calories and zero carbs, but it is highly acidic, carbonated, and contains food dyes and preservatives. The acidity comes mainly from citric and malic acid, which is harsh on tooth enamel over time.

AriZona Diet Arnold Palmer (Half & Half)

Sweetened with sucralose (Splenda). It contains real lemon and pear juice concentrates, which is why it has about 2 grams of carbohydrates per 12 ounces. It is not carbonated and does not contain phosphoric acid or caramel coloring.

Diet Coke

Sweetened with aspartame. It is zero-calorie and zero-carb, but uses phosphoric acid, which is a strong acid used in colas. Diet Coke also contains caffeine and caramel color, two ingredients that raise additional long-term health questions.

Coca-Cola Zero Sugar

Sweetened with aspartame and acesulfame potassium. It has the same acid profile as Diet Coke (phosphoric acid) but a different flavor formula and usually slightly less caffeine per can.

Side-by-Side Comparison

Drink Sweetener Carbs Acid Type Carbonated Caffeine
Diet Sunkist Aspartame + Ace-K 0g Citric & Malic Yes Yes
Arizona Diet Arnold Palmer Sucralose ~2g / 12oz Citric & Malic No Some
Diet Coke Aspartame 0g Phosphoric Yes Yes
Coke Zero Sugar Aspartame + Ace-K 0g Phosphoric Yes Yes

The real long-term risks

1. Tooth erosion

The American Dental Association confirms that acidic drinks erode enamel, even when sugar-free. This includes:

  • Colas

  • Citrus-based diet drinks

  • Lemonades and iced teas

The biggest danger is frequent sipping all day, which bathes teeth in acid for hours.

2. Artificial sweeteners

The FDA sets safe daily intake limits:

  • Aspartame: 50 mg per kg of body weight

  • Sucralose: 5 mg per kg

  • Ace-K: 15 mg per kg

These are conservative safety margins. However, in 2023 the World Health Organization classified aspartame as “possibly carcinogenic” based on limited evidence — while still affirming its safety within intake limits.

That means it’s not toxic — but it’s also not nutritionally beneficial.

3. Colas and bone density

A major study from the Framingham Osteoporosis Study found that cola consumption (diet or regular) was associated with lower hip bone density in women — but non-cola sodas were not.

The leading suspect: phosphoric acid, which interferes with calcium metabolism when consumed frequently.

So who wins?

🥇 Winner: Arizona Diet Arnold Palmer

Why?

  • No phosphoric acid

  • No caramel color

  • No carbonation

  • Real tea and lemon

  • Lower overall chemical load

Yes, it has 2g of carbs, but those come from real juice, not sugar syrup — and that amount is metabolically insignificant for most people.

🥈 Runner-up: Coke Zero Sugar

Zero carbs, no sugar — but still contains phosphoric acid and caffeine. Better than Diet Coke for most people, but still a cola.

🥉 Diet Coke

Same cola acid issues as Coke Zero, plus higher caffeine and long-term bone density concerns in heavy users.

❌ Last place: Diet Sunkist

Zero carbs, yes — but it is:

  • Carbonated

  • Highly acidic

  • Artificially colored

  • Preserved

That combination makes it rougher on teeth, gut, and long-term chemical exposure.

The Miami Rule

If you drink any of these:

  • Don’t sip all day

  • Drink with meals

  • Rinse with water

  • Don’t let colas become a daily addiction

In South Florida, hydration matters — but what you hydrate with matters more.

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