Protein Rules Just Flipped — How much do you actually need?

The real answer to “How much protein do I need?” is not a single magic number, but a range: there is a low bar to avoid deficiency, and a higher, goal‑dependent range where most adults actually live.

Key Points

The classic Recommended Dietary Allowance (RDA) of about 0.8 g/kg is a minimum to prevent deficiency, not an optimal target for every goal.^[1]^[3]^[17]
Newer U.S. dietary guidance and several experts now frame a typical adult range around 1.2–1.6 g/kg, with up to 2.0 g/kg in specific, higher‑demand situations.^[2]^[3]^[16]^[18]
Most Americans already meet or exceed even the higher ranges, but many distribute protein poorly across the day and rely heavily on ultra‑processed sources.^[3]^[9]^[20]
Older adults, people in weight loss or illness recovery, and athletes have the clearest evidence‑based need for protein intakes above the old RDA.^[3]^[7]^[18]^[20]
Above roughly 2 g/kg over the long term, benefits plateau and potential downsides for kidneys, metabolism, and weight control begin to matter—especially in people with underlying disease.^[5]^[18]^[19]

Why there is no single “right” protein number

Confusion about protein starts with a sleight of hand in how numbers are presented. For decades, public messaging leaned on a single figure: about 0.8 grams of protein per kilogram of body weight per day, or roughly 46 grams for the average woman and 56 grams for the average man.^[1]^[17] That figure is not a performance target. It was set to cover the needs of about 97–98% of healthy adults so they would not become clinically deficient in protein, based on nitrogen balance studies.^[1]^[3]^[6]^[17] Put plainly: it is a floor, not a ceiling, and not necessarily the sweet spot for strength, function, or long‑term health.

As research accumulated—on aging muscle, weight management, and athletic performance—scientists began to distinguish between “enough to survive” and “enough to thrive.” That is the gap CBS Mornings’ expert Keri Glassman is pointing to when she notes that the 0.8 g/kg RDA is “really just to not be deficient,” and then cites newer guideline ranges of 1.2–1.6 g/kg plus higher athlete‑oriented figures.^[2]^[3]^[16] The apparent conflict in coverage—0.8 g/kg in one segment, 1.2–1.6 g/kg in another—reflects this shift from minimums to goal‑based targets, not a collapse of the science.

The three main ranges: minimum, usual, and upper safe

Across federal guidance, clinical commentary, and sports nutrition research, three tiers emerge.

First is the **minimum**: about 0.8 g/kg per day for most adults, roughly 0.36 g per pound.^[1]^[3] This remains the official RDA in many documents and is still echoed in mainstream outlets and by major health bodies.^[1]^[3]^[4]^[8] For a 150‑pound adult, that is around 55 grams per day.^[3] It is adequate to maintain nitrogen balance in most sedentary, otherwise healthy adults, but it was never designed around outcomes like preserving muscle into old age, supporting intense training, or managing weight.

Second is the emerging **“usual target” range** for many adults: 1.2–1.6 g/kg per day. The latest U.S. dietary guidelines cited in recent reporting and Q&A pieces explicitly raise protein into this band, turning that same 150‑pound adult’s recommendation into roughly 80–110 grams per day.^[3]^[14]^[16] Glassman’s on‑air figure of 1.2–1.6 g/kg mirrors this shift.^[2]^[3]^[16]

Third is the **upper functional limit**: around 2 g/kg per day for the general population, with 2.0 g/kg widely cited as a prudent ceiling outside of specialized athletic or clinical settings.^[5]^[16]^[18] Both international nutrient reference reports and recent commentary on the new federal guidelines converge on that value.^[16]^[18]

Who genuinely benefits from more protein?

Not everyone needs to push into the 1.6–2.0 g/kg band, but several groups consistently emerge as higher‑need.

Older adults. Age‑related muscle loss (sarcopenia) is one of the most robust reasons to raise protein above the traditional RDA. Multiple analyses propose 1.0–1.2 g/kg per day for people over about 65, with per‑meal targets around 20–25 grams to stimulate muscle protein synthesis.^[7]^[20] Observational work shows that many older adults meet the 0.8 g/kg minimum yet fall short of these higher, more protective targets.^[20]

People losing weight or using weight‑loss medications. When calorie intake drops, the relative protein requirement to preserve lean mass rises. Clinicians now routinely advise the upper end of general ranges—around 1.6 g/kg, often based on adjusted rather than actual body weight—for patients actively losing weight.^[3] The goal here is defensive: retaining muscle and functional capacity while fat mass declines.

Athletes and highly active individuals. For endurance athletes and those engaged in regular resistance training, consensus statements land between 1.2 and 2.0 g/kg per day, with the higher end reserved for phases of intense training or aggressive muscle gain.^[5]^[7]^[18] That 1.4–2.0 g/kg figure cited in the CBS segment is typical of sports nutrition guidance aimed at performance settings, not office workers.^[2]^[5]^[7]

People recovering from illness, surgery, or injury. Healing tissues demand amino acids. Clinical protocols often increase protein intake well above baseline during recovery, although the exact target depends on the condition and is rightly individualized by a dietitian or medical team.

Are most people under‑eating or over‑eating protein?

From a distance, the protein debate sounds like a scarcity problem; up close, it is closer to a distribution and quality problem. National survey data show that U.S. adults already consume around 90–100 grams of protein per day for men and 65–75 grams for women, essentially in line with or above newer 1.2–1.6 g/kg recommendations for many body sizes.^[3]^[9] A CDC analysis using the older fixed gram targets found men averaging about 102 grams and women about 70 grams per day when the recommendation was 56 and 46 grams, respectively.^[9]

At the same time, pattern studies reveal that while total intake is often adequate, much of it is skewed toward the evening meal, with breakfast and lunch underpowered from a protein standpoint.^[20] In older and middle‑aged participants, fewer than half consistently hit even 1.0 g/kg per day across multiple days, and very few met proposed per‑meal thresholds thought to optimize muscle maintenance.^[20] In practice, that means an older adult may “meet the RDA” on paper while still drifting toward sarcopenia because nearly all of their protein arrives in a single nightly bolus.

Safety: how high is too high?

For healthy kidneys, short‑term intakes above the RDA—even into the 1.6–2.0 g/kg range—appear safe in controlled studies, and recent guideline reviews have explicitly concluded that protein “significantly exceeding” the old recommendations can coexist with good health.^[14]^[16]^[18] However, safety is not unlimited. A working group convened by the FAO recommended capping protein at about 2 g/kg per day for the general population, equating to roughly 120–150 grams for a typical adult, both to stay within a reasonable share of total energy and to avoid unknown long‑term effects in sedentary societies.^[18]

Beyond this, concerns begin to crystallize rather than remain theoretical. A large review of high‑protein diets found that when intake substantially exceeded recommended levels over time, markers of kidney workload—such as glomerular filtration rate and blood urea nitrogen—rose, and people with very high intakes (over 130 grams per day in one diabetic cohort) showed markedly higher odds of poor glycemic control compared with those eating well below the RDA.^[19]

Quality, source, and context matter as much as grams

The current wave of guideline revisions, and the pushback they have triggered, are not only about how many grams of protein to eat. They also concern where that protein should come from and what rides along with it. The latest U.S. guidelines that doubled protein targets also emphasized red meat, whole‑fat dairy, and even beef tallow, prompting criticism from cardiologists and public‑health experts who worry that such a shift may retrace the dietary patterns that contributed to heart disease in the mid‑20th century.^[14]^[16]

Globally, food‑based guidelines reveal two diverging strategies. Some countries encourage more plant‑based proteins while explicitly urging reductions in animal protein for health and sustainability reasons; others promote both animal and plant proteins without limits, focusing instead on diversity.^[2]^[15] Independent expert bodies like the American Heart Association lean toward the first approach, advocating beans, lentils, nuts, seeds, soy, fish, and lean poultry, with low‑fat dairy and smaller portions of red meat.^[3]^[8]

Putting it together: a realistic framework for your own intake

Given the evidence, an expert, goal‑based framework looks like this for most adults without major illness:

• Treat 0.8 g/kg as the minimum floor, not the target to beat by as much as possible.^[1]^[3]^[17]

• Aim roughly between 1.0 and 1.2 g/kg if you are a generally healthy, moderately active adult simply trying to maintain weight and function, nudging higher (1.2–1.4 g/kg) if you are over 65 or in weight loss.^[3]^[7]^[18]^[20]

• Move up toward 1.4–1.6 g/kg, potentially as high as 2.0 g/kg, under professional guidance if you are an athlete, heavy lifter, or in a phase of intense training or rehabilitation.^[2]^[5]^[7]^[16]^[18]

• Distribute protein across the day—on the order of 20–35 grams at each meal rather than one large bolus at night—especially in midlife and older age.^[2]^[7]^[20]

Layer onto that the qualitative advice that appears in almost every serious guideline: emphasize whole, minimally processed foods; favor plant sources and fish; choose lean cuts and low‑fat dairy when using animal protein.