The natural juice myth: a liquid sugar bomb

The natural juice myth: why that 1.5-litre bottle equals a full meal

With the arrival of summer, the temptation of refreshing juices soars. But what many consider a healthy choice is actually a nutritional trap. A 1.5-litre bottle of juice, even natural, can contain the calorie equivalent of a full meal, with a mountain of processed sugar that the body absorbs within minutes.

The figure nobody mentions: 40 kcal per 100 ml is not innocent

Natural fruit juices —orange, apple, tangerine— contain around 40 calories per 100 millilitres. It may not sound like much, but a large 250 ml glass already adds up to 100 kcal, and a 1.5-litre bottle reaches 600 kcal, the equivalent of a full lunch. What's more, the sugar in juice is absorbed extremely quickly, without the fibre that slows digestion in whole fruit. Squeezing three oranges for a glass is easy to drink, while eating those three pieces of fruit is far more filling.

A diabetic's testimony: "half a small bottle spikes my glucose in 5 minutes"

The most compelling evidence comes from those living with diabetes. With continuous glucose monitoring, it has been shown that half a small juice carton —the kind with a straw— raises blood sugar from 70 to 130 mg/dL in less than five minutes. It is a monstrous metabolic response that puts the body under enormous stress to process so much glucose at once. That's why people who monitor their glucose only use juice to rescue hypoglycaemia or before/after intense exercise. To quench thirst, it's useless: it doesn't hydrate and only provides empty calories.

Sensible alternatives: water, ice and whole fruit

Faced with this reality, the smart options are water —still or sparkling, cold— and whole fruit, which keeps the fibre and regulates sugar absorption. Some people also make green juices with celery or combinations of grapefruit and carrot, but even those should be consumed in moderation. The conclusion is clear: juice is not water; it is a sugar concentrate best treated as an occasional treat, not a regular drink.

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P.S.: If anyone doubts it, ask their glucometer. There's no better proof than numbers in real time.

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