Olestra vs Sodium Nitrate: which is worse?

What is Olestra?

Olestra (brand name Olean) is a synthetic fat substitute made from sucrose and fatty acids. Unlike regular fats, olestra is not absorbed by the digestive system — it passes through the body unchanged, providing zero calories while mimicking fat's texture and taste in food. It was developed by Procter & Gamble and FDA-approved in 1996.

What is Sodium Nitrate?

Sodium nitrate (NaNO3) is a naturally occurring salt found in soil and some plants, and also synthetically produced for use as a food preservative and curing agent. It is converted to sodium nitrite by bacterial action in foods or in the body, where it exerts its preservative and curing effects. Sometimes called 'Chile saltpeter' after its natural South American ore source.

Documented risks

Olestra: Olestra caused significant gastrointestinal side effects that were prominently noted on mandatory warning labels: 'This Product Contains Olestra. Olestra may cause abdominal cramping and loose stools. Olestra inhibits the absorption of some vitamins and other nutrients. Vitamins A, D, E, and K have been added.' Reported gastrointestinal effects included diarrhea, abdominal cramping, oily anal leakage ('anal leakage' or 'rectal leakage'), and fatty stools. These effects were often embarrassing and uncomfortable. Multiple consumer complaints documented GI distress from Olean chips. Beyond GI effects, olestra significantly inhibits the absorption of fat-soluble vitamins (A, D, E, K) and fat-soluble carotenoids (lycopene, lutein, beta-carotene). Since fat-soluble vitamins require fat for absorption, and olestra passes through without being absorbed, it 'captures' these vitamins and carries them out of the body. Studies found olestra consumption reduced serum carotenoid levels, prompting Frito-Lay to fortify olestra products with fat-soluble vitamins to compensate. The FDA removed the mandatory GI warning requirement in 2003 after Frito-Lay argued the warning was overstated, though olestra's use had already declined dramatically due to consumer avoidance.

Sodium Nitrate: Sodium nitrate shares the same health concerns as sodium nitrite: conversion to nitrosamines is the primary mechanism of concern. Sodium nitrate is converted to nitrite by bacterial reduction in foods and by nitrate-reducing bacteria in saliva before reaching the stomach. The subsequent conversion of nitrite to nitrosamines carries the same carcinogenicity concerns described for sodium nitrite. IARC's 2015 classification of processed meat as Group 1 human carcinogen applies to all nitrite/nitrate-cured processed meats. EFSA's 2017 re-evaluation established acceptable daily intakes (ADIs) for nitrate (3.7 mg/kg body weight/day) and nitrite (0.07 mg/kg body weight/day) based on risk assessment. A notable paradox in nitrate nutrition: dietary nitrate from vegetables (particularly leafy greens like spinach, arugula, and lettuce, and root vegetables like beets) is associated with cardioprotective effects through the nitrate-nitrite-NO pathway, where nitric oxide from dietary nitrate improves vascular function and reduces blood pressure. This beneficial effect of vegetable nitrate contrasts with the potential harm from processed meat nitrate/nitrite, suggesting that the food matrix and associated compounds (antioxidants in vegetables vs. amines in meat protein) significantly influence whether nitrite produces beneficial or harmful effects. Infant exposure to high nitrate levels — particularly from well water — can cause methemoglobinemia ('blue baby syndrome'). The EU and WHO set strict nitrate limits for infant water and food for this reason.