ATF4, "a protein in the skin of apples and green tomatoes that can help prevent the loss of muscle mass and weakening as we age."

Apples and green tomatoes can help keep your muscles young

"A new study from the University of Iowa have discovered a protein in the skin of apples and green tomatoes that can help prevent the loss of muscle mass and weakening as we age. Researchers discovered that within two months of eating the fruits’ skin, the atrophied muscles of an older person can be restored to that of a young person.

The study, published in the Journal of Biological Chemistry, is the first of its kind to identify the protein ATF4 as an essential mediator of muscle aging. This discovery could lead to new forms of treatment."