Calories
Plain, cited answers on the calorie side of the equation — why energy balance, not the diet label, drives fat loss, how many calories to eat, and why the "calories burned" number is a trap.
General training information, not medical advice. If you have pain, injury, or a medical condition, talk to a qualified professional.
Fat loss comes down to energy balance — eating fewer calories than you burn over time — and the specific diet is mostly a delivery method for that deficit. When researchers match calorie intake and put low-carb against low-fat head to head, weight loss comes out about the same; with calories and protein equal, the macro split barely moves the needle. That is why keto, intermittent fasting, and clean-eating all "work" for some people: each is a different way to eat less without feeling deprived, which creates the deficit. It also explains why they fail — a diet you cannot stick to will not hold a deficit, no matter how good the rules sound. The practical takeaway is to pick the eating pattern you can actually keep, get enough protein to protect muscle, and let the calorie balance do the fat-loss work. StrengthSync reads your energy balance from what you log and weigh, against your lifting, so you can see whether you are truly in the deficit your goal needs instead of trusting a diet label to do it for you.
Start with an estimate, then let your own results correct it — there is no single number that is right on day one. A common starting point is to estimate your maintenance calories (the amount that holds your weight steady), then adjust for your goal: a modest deficit of roughly 300 to 500 calories a day for fat loss, maintenance for a recomp, or a small surplus for muscle gain. The catch is that every calculator is a population average, so your true maintenance can be off by a few hundred calories either way. That is why the number you start with matters less than correcting it from real data: if your weight trend is not moving the way your goal needs over two to three weeks, nudge calories up or down. StrengthSync estimates your maintenance from your own weigh-in and intake trend rather than a generic formula, and tracks it against your lifting, so your calorie target sharpens from what is actually happening to you instead of staying a guess.
Because those numbers are among the least reliable things a fitness app shows you. In a Stanford study of seven popular wrist trackers, every device measured heart rate well but none measured energy burn well — the error on calories ranged from about 27 percent on the best device to 93 percent on the worst, and trackers almost always overestimate. That matters because the common move is to "eat back" the calories an app says you burned, which can quietly erase your whole deficit and stall fat loss. The burn side of energy balance is genuinely hard to measure from the wrist; the intake side — what you eat — is far more knowable. This is why StrengthSync does not hand you a spendable "calories burned" number to eat back. It reads your true energy balance from your weigh-in trend and what you log, against your lifting, so progress is judged by what is actually happening to your body rather than a burn estimate that could be off by half.
StrengthSync adapts your training session to session from your own data and explains each change in one plain line. More answers · See what it does.