How Much Protein Do You Actually Need? The 2025 Guidelines vs. the Gym Rule

Two numbers that contradict each other

Ask a government nutritionist how much protein you need and they will say 0.8g per kg of bodyweight per day — the Recommended Dietary Allowance set by the Dietary Reference Intakes framework, referenced in the 2025–2030 Dietary Guidelines for Americans. For a 200 lb (91 kg) person, that is 73g per day.

Ask anyone serious about body composition and they will say 1g per pound — roughly 2.2g per kg. For the same 200 lb person, that is 200g per day. Those two numbers are not even in the same ballpark. Understanding why they differ — and which one applies to you — is one of the most useful things you can know about nutrition.

What the RDA actually measures

The 0.8g/kg RDA is the minimum intake required to prevent nitrogen deficiency in a sedentary population. It is not a target for optimal health or body composition. It is a floor — the point below which you start to lose muscle mass just from inadequate intake, regardless of activity. Meeting the RDA means you are not protein-deficient. It says nothing about whether you are optimized.

This is a common source of confusion. The RDA is set for a sedentary adult with no muscle-building or preservation goals. If you are lifting weights, eating in a deficit, or trying to improve body composition, the RDA is essentially irrelevant to your planning.

What the research actually supports

A 2017 meta-analysis in the British Journal of Sports Medicine (Morton et al.) examined 49 studies and found that protein intakes beyond 1.62g/kg produced no additional gains in muscle mass in the context of resistance training. The range with the strongest evidence for muscle retention and growth is 1.6–2.2g/kg per day for active individuals.

For people in a calorie deficit specifically — where muscle preservation is under active threat from the catabolic state — the evidence favors the upper end of that range. A 2013 study by Helms et al. found that 2.3–3.1g/kg of lean body mass was optimal for drug-free resistance-trained individuals during a cut.

The practical target by goal

For fat loss with resistance training: 1.8–2.2g/kg bodyweight. At 200 lbs (91 kg), that is 163–200g per day. This is the range PrepForge uses to calculate your daily protein target.

For maintenance or lean bulk: 1.6–1.8g/kg. Slightly less aggressive but still well above the RDA. For sedentary individuals with no body composition goals: the RDA of 0.8g/kg is probably fine. But if you are reading a meal prep site, that is unlikely to be you.

Why hitting it is harder than it sounds

200g of protein per day is roughly equivalent to: 850g of cooked chicken breast. Or 7 large eggs plus 500g of ground beef. Most people eating a standard Western diet land at 80–120g without specific effort. Closing that gap requires building meals around protein sources rather than treating protein as an afterthought.

This is exactly why meal prep — with pre-cooked, pre-weighed protein at the center of every meal — is more effective than trying to hit protein targets ad hoc. When 50–60g of protein is already in the container in the fridge, hitting 200g across the day becomes a logistics problem, not a willpower problem.

The bottom line

Ignore the 0.8g/kg RDA for your planning. It was not designed for you. Use 1g/lb as a practical, research-supported target if you are lifting and managing body composition — it sits comfortably within the evidence-backed range and is easy to calculate. If you are in an aggressive cut, aim for the higher end. If you are maintaining, you can drift slightly lower without meaningful consequences.