1. Observe the bottom of the protein powder box. If there is a crack at the joint between the protein powder and the bottom of the powder box, it means that it is about to expire.

2. smell it. Expired protein powder doesn't smell good, but it smells moldy and rancid.

3. Try it. Take a small amount and try it. If it tastes moldy and bitter, it proves that it has expired.

Suitable crowd and dosage of protein powder

1. Applicable people

For the special population in need, apart from supplementing essential amino acids through food, protein powder can be appropriately selected as the supplement of protein, but we must pay attention to the dosage of protein powder. After protein is digested and absorbed by gastrointestinal tract, it needs to be processed by liver and converted into human substances for human use.

At the same time, ammonia, urea, creatinine and other nitrogen-containing substances metabolized by protein in the body need to be excreted through the kidneys. If a person ingests too much protein, it will increase the burden of liver and kidney and have a negative impact on the human body. Therefore, protein is by no means the more the better. The highest intake of protein in the Dietary Guidelines for China Residents is 0.92g per kg of body weight, and if it exceeds this amount, it may be harmful to human health.

2. Dosage and precautions

Protein intake varies with people's age, weight and labor intensity. During the growth and development of children and adolescents, pregnant women or lactating women generally have a high demand for protein.

(1) Take it according to the recommended intake.

Because the raw materials and processes used by each manufacturer are not exactly the same, the label description has its own recommended dosage of protein powder, so users should not increase or decrease it at will. Eating too little can't achieve the expected goal; Eating too much will cause waste or side effects.

(2) Don't take it on an empty stomach.

Eating protein powder on an empty stomach will be consumed as a general "hot food", wasting valuable high-quality protein sources. So, eat some other foods before or at the same time as eating protein powder. Patients can only eat liquid, and can add protein powder to milk, soybean milk, cereal, malt extract and other foods to eat together.

(3) Eat warm or cold, not hot or hot.

Whey protein powder contains many active substances with special physiological functions. They are all afraid of heat, and once heated, they will lose their activity, thus greatly reducing their biological potency. Therefore, whey protein powder must not be cooked or burned, but can only be dissolved (mixed) in water, porridge, malt extract and other foods below 40℃, and can also be eaten as a cold drink.

(4) Adding condiments should be controlled.

Protein powder can be added to various foods, such as sweet with sugar and salty with salt, but not too much. Because too much sugar and salt intake is not good for human health. Also, don't add monosodium glutamate to eat protein powder, because protein powder itself has a certain flavor, and the proportion of amino acids in whey protein powder is better, and monosodium glutamate is a component of monosodium glutamate, which decomposes glutamic acid after metabolism in the body. Adding monosodium glutamate to protein powder is tantamount to gilding the lily.

(5) Do not eat with acidic drinks.

Apple juice and other beverages contain organic acids, which will form clots when encountering protein powder, affecting digestion and absorption.

References:

Public health network-how to judge whether protein powder has expired