Your Strength Drops Faster Than Your Weight
The most reliable early signal is not on the scale, it is on the barbell. If your bench press or squat numbers fall by 10 to 15 percent within two to three weeks of cutting calories hard, your body is almost certainly cannibalising muscle tissue for fuel. Fat loss does not reduce contractile strength. Muscle loss does. A 2014 meta-analysis published in the Journal of the International Society of Sports Nutrition, led by researcher Eric Helms, found that athletes in aggressive caloric deficits who did not meet protein targets lost measurable lean mass within weeks, reflected directly in performance output. If your lifts are collapsing while your diet is working, the diet is working on the wrong thing.