For protein intake helping decrease this: https://faseb.onlinelibrary.wiley.com/doi/abs/10.1096/fj.13-239228 https://faseb.onlinelibrary.wiley.com/doi/abs/10.10

For protein intake helping decrease this: https://faseb.onlinelibrary.wiley.com/doi/abs/10.1096/fj.13-239228 https://faseb.onlinelibrary.wiley.com/doi/abs/10.1096/fj.13-... https://faseb.onlinelibrary.wiley.com/doi/epdf/10.1096/fj.13-230227 https://faseb.onlinelibrary.wiley.com/doi/epdf/10.1096/fj.13... https://faseb.onlinelibrary.wiley.com/doi/epdf/10.1096/fj.14-266890 https://faseb.onlinelibrary.wiley.com/doi/epdf/10.1096/fj.14... https://www.sciencedirect.com/science/article/pii/S2161831322009760 https://www.sciencedirect.com/science/article/pii/S216183132... https://www.mdpi.com/2072-6643/12/8/2457 https://www.mdpi.com/2072-6643/12/8/2457 For weight lifting helping decrease this: https://www.mdpi.com/2072-6643/11/11/2824 https://www.mdpi.com/2072-6643/11/11/2824 https://journals.physiology.org/doi/full/10.1152/japplphysiol.01346.2007 https://journals.physiology.org/doi/full/10.1152/japplphysio... https://link.springer.com/article/10.1007/s00726-013-1506-0 https://link.springer.com/article/10.1007/s00726-013-1506-0 https://journals.physiology.org/doi/full/10.1152/ajpendo.00590.2013?rss=1 https://journals.physiology.org/doi/full/10.1152/ajpendo.005... https://onlinelibrary.wiley.com/doi/abs/10.1002/mus.21780 https://onlinelibrary.wiley.com/doi/abs/10.1002/mus.21780 https://journals.physiology.org/doi/full/10.1152/ajpregu.00413.2014?view=long&pmid=26136534& https://journals.physiology.org/doi/full/10.1152/ajpregu.004... https://www.mdpi.com/2072-6643/10/4/423 https://www.mdpi.com/2072-6643/10/4/423 These are just a tiny subset of the studies done - google scholar can find you many dozens more, if you desire. And, of course, the fact that these studies exist it all necessarily implies that you lose muscle mass when in energy deficit, as you will see in the control groups for them.