Can a product with "0g sugar" contain lactose?

Original Article ↗ Hacker News Discussion ↗

Food labeling rules allow products advertised as having “0g sugar” to still contain small amounts of lactose, often hidden behind tiny serving sizes and rounding rules, particularly in the US. Commenters compare US and EU regulations, noting how per‑serving vs per‑100g labeling and “as prepared” values can obscure real sugar and calorie content, and cite examples like cooking sprays and Tic Tacs. People with lactose intolerance or dairy allergies describe relying on enzyme pills, lactose‑free products, and strict avoidance, arguing that current standards are inadequate for consumers who depend on accurate labels to avoid pain or serious health risks.

Serving sizes, rounding, and “0g” claims

  • FDA “serving size” is defined as what people “customarily consume,” but commenters note manufacturers can choose unrealistically small servings, with little penalty.
  • In the US, nutrients are per serving and values under 0.5 g can be rounded to 0 g.
  • This allows products like cooking spray (pure fat) or Tic Tacs (mostly sugar) to show “0 g fat/sugar” per serving by making the serving tiny.
  • One comment calls the FDA effectively “legalized rounding,” noting attempts to chain rounding steps to hit regulatory thresholds.

US vs EU/other-region labeling

  • EU: mandatory per-100 g / 100 ml values “as sold”; per-portion is optional. This makes product comparison easier.
  • There is an exception: labels may give values “after preparation” if instructions are detailed, which some see as a loophole for dilution/serving-size games.
  • Some countries (e.g., Australia, much of Europe) routinely show both per 100 g and per serving; North America typically shows only per serving, which calorie trackers find frustrating.

“0g sugar” and lactose

  • “0 g sugar” in the US means <0.5 g sugar per serving; products can contain measurable lactose yet still claim 0 g.
  • In Europe, lactose counts as “sugar”; still, there can be small amounts and trace caloric content (e.g. “zero sugar” energy drinks with ~2 kcal/100 ml).
  • People with strong intolerance often assume up to ~0.5 g lactose may be present unless a product is explicitly labeled lactose-free.

Managing lactose intolerance and dairy alternatives

  • Intolerance is described as a spectrum; some tolerate small amounts or hard cheese, others react strongly to minimal lactose.
  • Many rely on lactase pills before eating dairy; others prefer lactose-free milk, arguing added lactase in the milk works better than pills.
  • Discussion on processing: standard lactose-free milk uses lactase to split lactose into glucose + galactose (tastes sweeter); some brands also remove part of the lactose via (ultra)filtration.
  • Question raised about diabetics: splitting lactose produces more “fast sugars,” so blood sugar impact must be considered.

Plant milks, additives, and nutrition

  • Plant-based “milks” are criticized by some as “pure chemistry” due to stabilizers, phosphates, and thickeners; others argue these are standard food-tech ingredients and can be used at home.
  • Concerns about phosphate load, particularly for people with kidney or vascular issues.
  • Environmental concerns mentioned, especially high water use for almonds, but not deeply resolved.
  • On vegan diets, participants debate supplement needs (B12, D, iron); consensus that B12/D often require attention but can be cheap and/or fortified.

Hidden lactose in foods

  • Examples cited: some dry sausages, certain beers (milk sugar for sweetness), instant dashi powders, and any product using whey powder.
  • Travelers note that lactose is usually listed in EU ingredients but only in the local language, making it easy to miss.

Food allergies, coeliac, and trust in labels

  • Several describe severe dairy protein allergy (distinct from lactose intolerance) and coeliac disease.
  • They emphasize strict avoidance, mistrust of restaurant assurances, and the need for household-level control (e.g., fully gluten-free homes).
  • Frustration with lax allergen labeling and enforcement is common; people feel they must assume some risk or damage when eating out.
  • A tragic anecdote about a fatal allergy reaction is used to argue for extreme caution and not outsourcing safety to under-incentivized staff.

Health experiences and US food system critique

  • Personal stories describe years of misdiagnosed pain/bowel issues resolved by eliminating lactose, with notable mental-health benefits.
  • Some newcomers to the US suspect differences between cow milk vs buffalo milk or fat vs lactose content but remain unsure.
  • Broader criticism of the US food system: heavy use of sugar substitutes, sodium, preservatives, and marketing-driven labels makes it hard to eat “real food” or rely on claims like “0 g sugar.”

Miscellaneous tangents

  • Clarification that “energy drinks” with zero calories provide stimulation mainly via caffeine and other compounds, not caloric energy; placebo-like effects are mentioned.
  • Side discussion on buffalo mozzarella vs cow-milk mozzarella, mostly about taste and cost, largely unrelated to labeling or lactose.