Should You Wash Rice Before Cooking? Science Says It May Not Matter

Many home cooks automatically rinse rice when preparing it for cooking. This practice is steeped in tradition and is often thought to get rid of dirt and help produce the best texture. Some believe that this will give you fluffy rice, while others think that it will prevent rice from being sticky. However, there might be something else at play here.

Scientific evidence indicates that the effect of rinsing rice on texture might be less pronounced than one would expect. Although rinsing does get rid of any excess dust, the remnants of the bran, and some of the starch on the rice, studies show that rinsing rice does little to affect its texture after cooking.

What rinsing rice actually does

Rice, traditionally, is always cleaned by washing to eliminate any remnants left during the milling process. In the case of certain types of rice, especially those which have been imported or are not processed properly, additional rinsing will help clean and minimize some of the excess lipids, which might cause a stale smell.

However, there is yet another trade-off in the whole process. According to an article in Food Chemistry, excessive washing may result in the removal of certain water-soluble nutrients, such as particular B vitamins, iron, and zinc.

This practice is influenced by culture. As far as basmati rice is concerned, the tradition is widespread among Indians in South Asia, who often wash it several times. Asians, in general, usually rinse their rice, although less vigorously, depending on its variety.

Does rinsing change texture?

This is where science comes up against everyday culinary wisdom.
An experiment reported in the Journal of Cereal Science has shown that rinsing rice prior to cooking makes no discernible difference to hardness and stickiness, both important texture criteria. Several types of rice were tested, and scientists reached the conclusion that rinsing makes no difference to the texture of the rice at all.
This might be surprising since it would appear that by rinsing, we wash away the starch.

Yet according to science, the surface starch does not really affect the texture of the cooked rice. The true factors determining the texture are those contained within the grain itself.

The starch science behind fluffy or sticky rice

The texture of rice is mainly determined by its two major constituents, namely amylose and amylopectin, found in the kernel.
Amylose makes the rice firmer and fluffy, while amylopectin makes it sticky. The proportions of these vary across different types of rice, explaining why jasmine rice, sushi rice, and long-grain rice all have their specific properties. As reported by Food Chemistry, rinsing cannot significantly alter the internal starch structure that determines the above features. It is when the transformation process of the starch takes place due to heat and moisture that gelatinization and starch retrogradation come into play.
In other words, the type of rice might affect the texture much more than rinsing.

What affects rice texture more than washing

In case the aim is to achieve texture, specialists recommend otherwise.
The cooking process is crucial. Scientists proved that the ratio of water, the duration of cooking, and the distribution of heat impact the hardness and stickiness of the grains rather than the washing process. The rice boiled in the rice cooker will not behave the same way when cooked in the stove.
Even cooling the cooked rice will influence the texture. According to research, keeping the rice in the fridge might result in starch retrogradation, making the product firmer.

Also, do not neglect the aroma. The scientific journal Foods published an article stating that the texture and aroma of rice correlate with specific flavor compounds. In other words, the rice consumption quality is more than its stickiness.

So, should you wash rice or skip it?

It all depends on your reasoning. If you wash rice due to concerns about cleanliness, personal preference, or to get rid of impurities, it can be justified. Some types of rice need washing; they contain starch or other particles visible to the naked eye.

However, if you are washing it simply to reduce stickiness or significantly enhance the texture, scientific literature does not seem to support such claims.
Perhaps, for most home cooks, there is no reason to believe that rinsing the rice will make it less sticky or improve its texture.

Rinsing rice is not wrong. However, it might not have a significant effect on cooked rice texture, contrary to popular belief. According to science, factors like the type of rice grain used or cooking methods play a greater role than rinsing rice beforehand. So, the next time you find yourself in front of a sink with rice in hand, remember this – you can skip the rinse without jeopardizing your meal.