Both nutrition and physical activity are critical if you want to gain lean muscle.
But without proper nutritional support, your progress will stall.

If your goal is to gain lean muscle, you should focus on exercising regularly and eating more calories each day from musclebuilding foods.

Here are 7 of the top foods for gaining lean muscle.

Further reading: https://www.healthline.com/nutrition/...

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Studies mentioned:

STUDY 1: https://www.ncbi.nlm.nih.gov/pubmed/2...