Phosphoric Acid (E338): Why Your Cola Might Be Weakening Your Bones

TL;DR

Phosphoric Acid (E338) is a cheap, mass-produced acid used to give cola drinks their tangy "bite" and prevent mold. Unlike lemon juice (citric acid), it has no nutritional value. High consumption is linked to lower bone density, kidney stones, and tooth enamel erosion. Kale rates it as Caution (Orange).

What is Phosphoric Acid (E338)?

It is a colorless, odorless inorganic acid produced from phosphate rock. It is vastly cheaper than natural fruit acids like citric or tartaric acid, which is why it's the acid of choice for giant soda corporations.

Fun fact: Industrial-grade phosphoric acid is used to remove rust from metal. Food-grade is more diluted, but it's the same chemical.

Where is it found?

It is surprisingly specific in its use.

• Dark Colas: Coke, Pepsi, Dr. Pepper, and their diet versions. (Clear sodas like Sprite usually use Citric Acid).
• Processed Cheese: Used as an emulsifier to keep cheese slices smooth and meltable.
• Iced Teas: Some bottled tea brands use it for tartness.
• Meat Products: Added to ham and deli meats to retain moisture.

Health Concerns

1. Bone Density Loss

This is the big one. Phosphoric acid intake has been consistently linked to lower bone density, particularly in women. The theory is that the body aggressively pulls calcium from bones to neutralize the high acid load, leading to weaker skeletons over time.

2. Kidney Stones

High phosphate intake forces the kidneys to work overtime to filter it out. Studies indicate that drinking two or more colas a day (diet or regular) is associated with a 2x risk of chronic kidney disease.

3. Tooth Enamel Erosion

Phosphoric acid is extremely acidic (pH around 2.5). Sipping it throughout the day bathes your teeth in acid, softening the enamel and making them prone to cavities and sensitivity.

Kale's Verdict: Caution (Orange)

Kale rates E338 (Phosphoric Acid) as Caution (Orange).

It won't kill you instantly, but it is an "anti-nutrient". It takes minerals away from your body rather than giving them. There is simply no biological need to consume it, especially when safer, natural acids exist.

We rate it Orange because occasional consumption is manageable for healthy adults, but daily habits can have long-term structural consequences for your body.

How to Avoid It

1. Switch to Clear Sodas: If you must drink soda, clear ones (lemon-lime) or Root Beer often use Citric Acid instead.
2. Scan with Kale: We'll check the acidifier used in your drink.
3. Drink Water with Lemon: Get your tart kick from natural Vitamin C.
4. Use a Straw: If you drink cola, use a straw to bypass your teeth and minimize acid contact.

Final Thoughts

We love a cold drink, but we prefer ours without the rust-removing chemical. Your bones will thank you for choosing something else.

Is your favorite drink dissolving your calcium? Download Kale and find out.