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  • Writer's pictureAmie

Casein protein + carbohydrates before bed

Updated: Oct 5, 2023

Consuming casein protein at night is a common practice among athletes, bodybuilders, and fitness enthusiasts. Casein is a slow-digesting protein derived from milk, known for its ability to provide a sustained release of amino acids (the building blocks of muscle repair/growth) into the bloodstream over a longer period compared to other proteins like whey.


What most people do not know though is combining casein with a carbohydrate source will aid muscle recovery even moreso than having the casein protein alone.


So lets understand the process before we talk about carbs.


Here are a few reasons why people often choose to consume casein protein at night:

  1. Muscle recovery and growth: During sleep, your body undergoes significant repair and recovery processes. Casein protein provides a slow and steady release of amino acids, which can help support muscle protein synthesis throughout the night. This prolonged availability of amino acids may enhance muscle recovery and growth.

  2. Preventing muscle breakdown: By consuming casein protein before bed, you can help prevent muscle breakdown during the overnight fasting period. The slow digestion and absorption rate of casein provide a sustained amino acid release, which can counteract muscle protein breakdown and promote a positive net protein balance.

  3. Feeling fuller for longer: Casein forms a gel-like substance in the stomach, which slows down the rate of gastric emptying. This slow digestion can help you feel fuller for a more extended period, potentially reducing nighttime hunger cravings and helping you adhere to your dietary goals.

  4. Promoting satiety: Casein protein is high in quality and contains all essential amino acids. Adequate protein intake is associated with increased satiety and can help regulate appetite. By consuming casein before bed, you may feel satisfied and less likely to snack or overeat during the night.

Why do we add a carbohydrate source?

  1. Sustained nutrient release: Casein, provides a steady release of amino acids throughout the night. Pairing a slow-digesting casein protein with carbohydrates can further enhance this sustained release, ensuring a continuous supply of nutrients for muscle repair and growth during sleep.

  2. Increased insulin response: Consuming carbohydrates stimulates insulin release, which AIDS in transporting amino acids from the casein protein into your muscles. This insulin response can support muscle protein synthesis and reduce muscle protein breakdown during the overnight fasting period.

For the LACTARDS like me: If you are lactose intolerant or have difficulty digesting lactose, consuming casein protein, which is derived from milk, may cause digestive discomfort and symptoms such as bloating, gas, diarrhea, or stomach cramps. Lactose intolerance occurs when your body lacks the enzyme lactase, which is necessary to break down lactose, the sugar found in milk and dairy products.


However, there are lactose-free or low-lactose alternatives available in the market, including casein protein powders made from lactose-free or hydrolyzed casein. These products are typically processed to remove or break down the lactose content, making them suitable for individuals with lactose intolerance.


It's important to note that individual protein needs vary, and the timing of protein intake, including casein, may depend on personal preferences and goals. Consulting with a healthcare professional or an accredited dietitian can help determine the optimal protein intake and timing based on your specific needs.



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