What Happens If You Don't Rinse Rice? The Science of Starch

The Short Answer

When you cook rice without rinsing, the surface starch dissolves into the cooking water and makes the finished rice stickier, gummier, and more likely to clump. Whether that is good or bad depends entirely on what you are cooking.

For sushi rice and risotto, some surface starch is desirable. For pilaf, biryani, or any dish where you want separate, fluffy grains, rinsing is essential.

For more on this topic, see our guide on The Science of Rice Cooking: Starch, Heat & Fuzzy Logic.

What Surface Starch Actually Is

For more on this topic, see our guide on What the ‘Keep Warm’ Function is Actually Doing to Your Rice.

Raw rice grains are coated in a fine powder of loose starch. This starch is released during the milling process when the hard outer bran is polished away from white rice. Brown rice has very little surface starch because the bran layer is still intact.

This starch is primarily amylopectin, a branching starch molecule that gelatinizes quickly in hot water and creates a thick, sticky gel. When you cook unrinsed rice, this gel coats every grain, bonding them together.

The cloudy water you see when you rinse rice is this starch dissolving. Three rinses typically removes 80-90% of the surface starch. You can never remove it completely, and you don’t need to.

When to Rinse

Always rinse for:

• Steamed white rice (any variety)
• Jasmine rice
• Basmati rice
• Long-grain rice for pilafs and side dishes
• Fried rice (you want dry, separate grains)
• Any time you want fluffy, individual grains

How to rinse properly:

1. Place measured dry rice in the inner pot or a fine mesh strainer
2. Add cold water, swirl gently with your hand for 10-15 seconds
3. Pour off the cloudy water
4. Repeat 2-3 times until the water is mostly clear (it never goes crystal clear)
5. Drain well before adding measured cooking water

The common mistake: Aggressive scrubbing. You are not washing laundry. Gentle swirling is sufficient. Vigorous rubbing can crack the grains, leading to mushier rice.

When Not to Rinse

Skip rinsing for:

• Risotto (Arborio, Carnaroli, Vialone Nano). The surface starch is what creates risotto’s signature creamy texture. Rinsing would make risotto watery.
• Rice pudding. Again, the starch creates the thick, creamy consistency.
• Enriched rice. Some rice sold in the U.S. is enriched with powdered vitamins and minerals (thiamin, niacin, iron, folic acid). Rinsing washes away these added nutrients. The package will say “enriched” on the label.
• Paella (debated). Traditional Spanish cooks generally do not rinse bomba rice because the surface starch helps the socarrat (the crispy bottom layer) form. Some modern recipes disagree.

The Starch Science

Rice contains two types of starch:

Amylose is a straight-chain molecule. It does not gelatinize as easily and produces drier, firmer-textured rice. Long-grain varieties like basmati have high amylose content (22-28%), which is why they cook up fluffy and separate.

Amylopectin is a branching molecule. It gelatinizes quickly and creates stickiness. Short-grain and glutinous rice have very high amylopectin content (up to 100% in glutinous rice), which is why they are naturally sticky.

The surface starch you rinse off is mostly amylopectin. By rinsing, you are reducing the stickiness factor before cooking even begins.

Does Rinsing Affect Nutrition?

Minimally. Rinsing removes a small amount of starch (carbohydrates), which slightly reduces the calorie content. The reduction is negligible — perhaps 5-10 calories per serving.

The bigger nutritional concern is enriched rice. If your rice is enriched and you rinse it, you lose some of the added B vitamins and iron. Non-enriched rice (most Asian imports) has nothing to lose from rinsing.

Arsenic is another consideration. Some studies have found that rinsing rice reduces inorganic arsenic content by 10-28%. If arsenic in rice is a concern for you (it can be for people eating rice multiple times per day, or for young children), rinsing is one simple mitigation step. Cooking rice in excess water and draining also reduces arsenic, though this method is more effective.

The Soaking Question

Soaking goes one step further than rinsing. After rinsing, you leave the rice submerged in clean water for 20 minutes to several hours.

What soaking does:

• Hydrates the grain core, leading to more even cooking
• Reduces cooking time by 10-20%
• Can improve texture for brown rice and older rice

When to soak:

• Brown rice (30-60 minutes recommended)
• Wild rice (1-2 hours)
• Glutinous/sticky rice (4-8 hours, essentially mandatory)
• Aged rice (older rice benefits from 30-minute soak)
• Sushi rice (traditional Japanese preparation includes 30 minutes of soaking)

When soaking is unnecessary:

• Fuzzy logic rice cookers typically include a soaking phase in their programming
• Quick-cooking or parboiled rice is pre-soaked during manufacturing
• Jasmine rice (it can become too soft if soaked)

Rinsing by Rice Cooker Type

Cooker Type	Should You Rinse?	Notes
Basic (on/off)	Yes, always	No built-in rinse compensation
Digital (MICOM)	Yes	Some have slightly adjusted water lines
Fuzzy Logic	Yes	Cooker adjusts, but rinsing still helps
IH (Induction)	Yes	Same as above
Pressure IH	Yes	Same as above

No rice cooker eliminates the need to rinse. The technology adjusts for cooking variables, but it cannot remove surface starch from unrinsed rice.

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Frequently Asked Questions

How many times should I rinse rice?

Two to three times is sufficient for most white rice. The goal is to go from very cloudy water to slightly cloudy water. You do not need to rinse until the water is perfectly clear — that level of rinsing can actually remove too much starch from sushi rice and short-grain varieties.

Can I rinse rice the night before?

You can rinse and soak overnight in the refrigerator. The rice will absorb some water, so reduce your cooking water by 1-2 tablespoons per cup. Do not leave soaked rice at room temperature overnight, as it can ferment.

Does rinsing remove pesticides?

Rinsing removes some surface residues, but it is not an effective way to remove systemic pesticides that are absorbed into the grain during growing. If pesticide exposure is a concern, buying organic rice is more effective than extra rinsing.