The Claim

In young, recreationally active males undergoing supervised resistance training four times per week for 10 weeks, consuming 35 grams of casein protein either 3 or more hours before sleep or earlier in the day (at least 3 hours removed from exercise and sleep) leads to comparable increases in lean soft tissue mass, muscle cross-sectional area, and strength, provided that total daily protein intake is matched at approximately 1.8 g/kg body weight and diets are isocaloric.

Source: Daytime and nighttime casein supplements similarly increase muscle size and strength in response to resistance training earlier in the day: a preliminary investigation

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
58score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Cause and effect
1 study reviewed
In plain English

If young, active guys lift weights 4 days a week and eat the same total amount of protein, it doesn’t matter whether they have their casein protein late at night or earlier in the day — they’ll gain similar muscle and strength over 10 weeks.

See the scientific wording

In young, recreationally active males performing supervised resistance training 4 days per week for 10 weeks, consuming 35 grams of casein protein either 3 or more hours before sleep or earlier in the day (at least 3 hours removed from exercise and sleep) results in similar increases in lean soft tissue, muscle cross-sectional area, and strength, when total daily protein intake is matched at approximately 1.8 g/kg body weight and diets are isocaloric.

What the research says

1 study
  1. Study: Daytime and nighttime casein supplements similarly increase muscle size and strength in response to resistance training earlier in the day: a preliminary investigation

    The study found that taking casein protein either during the day or before bed worked equally well for building muscle and strength when total protein and calories were the same.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

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