“Natural” does not necessarily mean healthy. Remember, table sugar is natural too. We intuitively suspect that natural ingredients are more likely to be well tolerated by the body and to not have unexpected, detrimental health consequences. Many artificial compounds have unexpected interactions with our complex biology. Here is a list of synthetic sweeteners and evidence that led us to avoid them. Some are reasonably safe to consume in reasonable quantities, but why consume them if we can enjoy natural and healthy sweet ingredients instead?
Most Common ARTIFICIAL Sweeteners and WHY we AVOID them
Maltitol
This is the MOST COMMON sweetening ingredient in ‘sugar-free’ chocolate. WHY? Because it tastes like sugar, feels like sugar, and behaves like sugar. Food companies love it for this, coupled with the fact that they can state that the product has 0g / 100g sugar. Maltitol has c. 2.8-3.5 calories per gram, similar to sugar (4 kcal/g). It is metabolized into sorbitol and glucose. Sorbitol in turn is metabolized into fructose. Sound familiar? Glucose + Fructose = Sucrose (Sugar).
WHY AVOID?
- MOST IMPORTANTLY, maltitol in humans is largely absorbed by the small intestine and it breaks down into SORBITOL (which breaks down to fructose + glucose) + glucose, the very monosaccharides that comprise SUCROSE (iv, v, vi). Sugar-free on the label, SUGAR INSIDE the body. What is not absorbed by the small intestine is fermented by colonic bacteria, and there is insufficient research yet on whether or not it has a detrimental effect therein.
Isomalt
Isomalt breaks down into glucose (50%), sorbitol (25%) and mannitol (25%) (i). Mannitol is – like sorbitol – metabolized into fructose. It has c. 2kcal/g.
WHY AVOID?
- Isomalt is a LAXATIVE and causes borborygmi, colic, stomach-ache, bloating, and flatulence at doses of 25g-40g (ii, iii, iv).
Sorbitol
Thankfully, this sweetener is less often used in chocolate and food products these days, mainly due to its highly laxative effect, but you will still find it in some products. It is metabolized to fructose. What is so paradoxical about sorbitol as a choice away from sugar, is that it feeds into a pathway that is directly associated with diabetes: the polyol pathway that generates fructose and creates reactive oxygen species, mitochondrial dysfunction, and advanced glycation end products (AGEs) (i).
WHY AVOID?
- Sorbitol is metabolized into glucose and fructose, i.e. sugar. This does not help those aiming to avoid sugar.
Acesulfame K (Ace-K)
Ace-K is an artificial sweetener with a slightly bitter aftertaste, so you will often find it in combination with other artificial sweeteners. It is common in artificially-sweetened drinks.
WHY AVOID?
- Ace-K has been shown to cause WEIGHT GAIN in animal studies, albeit at >double the dose one might expect to consume in one day. These same studies also observed epigenetic changes in energy metabolism genes which provide a possible explanation for the weight gain (i, vi).
Aspartame & Neotame
Aspartame is an artificial sweetener that breaks down into aspartic acid, phenylalanine, and methanol. Products containing it must provide a warning label for phenylketonuria patients. Methanol is further broken down into formaldehyde. There are thousands of studies on the independent, adverse health impacts of excessive aspartic acid, phenylalanine, and methanol.
NEOTAME is made from ASPARTAME and is very similar structurally. Because neotame is 7,000-13,000x sweeter vs. SUGAR, it can be used in tiny quantities and be HIDDEN in the words “flavors” or “flavoring” on food labels.
WHY AVOID?
- KEY: most aspartame studies have been performed on rats, which hydroxylate (transform) aspartame 5x faster than humans, so studies on rats using the acceptable daily intake (ADI) of 40mg/kg body weight for humans, might show benign results, yet show adverse impacts at 200mg/kg body weight, which might be the relevant-to-human dose (i).
Saccharin
Saccharin (a.k.a. benzoic sulfimide) is an artificial sweetener with a metallic aftertaste at high concentrations.
WHY AVOID?
- Saccharin reduces plasma antioxidants and generates OXIDATIVE STRESS and excess reactive-oxygen species (ROS). It increases lipid peroxidation and secondary oxidants and DNA-reactive aldehydes that may lead to DNA damage (i, ii).
D-Tagatose (Tagatose)
Tagatose is a similar molecule to fructose and appears to have similar metabolic consequences. The question is how much is absorbed. Tagatose is promoted as a sugar that is not as readily absorbed and metabolized as sucrose. However, the amount absorbed and metabolized varies significantly in studies. In animal studies: the amount absorbed appears to be around 20% to 25%. Meanwhile, in human research, the absorbed and metabolized amount appears to range from 66% to 81% (i).
WHY AVOID?
- If the amount absorbed and metabolized is discovered to be minimal in humans, then this sweet ingredient may be useful. However, until definitive research indicates this, tagatose has a similar metabolic pathway to fructose and is thus not helpful to consumers looking to reduce sugar consumption.
Sucralose
Sucralose is produced by chlorination of sugar and is a highly stable molecule, so much so that it is used to track water pollution. It is accumulating in the environment, with unknown long-term consequences. It was created during the production of an insecticide and is now used in many artificially-sweetened food and drink products.
WHY AVOID?
- Sucralose appears to LOWER INSULIN SENSITIVITY - even at 15% of the ADI in healthy humans (ii) - and may cause HYPERINSULINEMIA and SIGNIFICANTLY INCREASED LIPOGENESIS (FAT CREATION) and inflammation (ii, iii).
WHAT CAN YOU DO?
CHECK THE INGREDIENTS LABEL
Avoid or Minimize these Artificial Sweeteners:
- Maltitol
- Isomalt
- Sorbitol
- Acesulfame (Ace-K)
- Aspartame and Neotame
- Saccharin
- Tagatose
- Sucralose