| Course | HW320 Contemporary Diet and Nutrition |
|---|---|
| Unit | Unit 4 |
| Paper type | Reference standard comparison |
| Length | About 910 words, 6 pages double-spaced |
| Format | APA 7 student paper |
| School | Purdue University Global |
| Program | BS in Health and Wellness |
| Updated | October 2026 |
Free sample paper for HW320 Unit 4
The Wrong Yardstick, Printed Confidently: A Unit 4 Reference Standard Comparison for a 26-Year-Old Man
[Student Name]
Purdue University Global
HW320: Contemporary Diet and Nutrition
Unit 4 Reference Standard Comparison
[Instructor Name]
[Date]
The man, his record and every intake figure are composite; the reference intakes and federal labeling values cited are real.
The Record
Andre, a composite 26-year-old bike mechanic, kept a three-day food record in a nutrition app. His diet is mostly home-cooked: oatmeal with nuts, black bean and rice bowls, chicken, eggs, milk, fruit and a lot of peanut butter. He takes no supplements. The app averaged his three days and compared each nutrient with the percent Daily Value printed on food labels.
Why the Standard Matters
Daily Values are single reference numbers chosen for food labels so that consumers can compare products; they are not tailored to age or sex (Food and Drug Administration [FDA], 2016). The Dietary Reference Intakes are the standards for assessing an individual's intake, set separately for each life stage and sex. They include Recommended Dietary Allowances, Adequate Intakes where an RDA cannot be set, Tolerable Upper Intake Levels and, for sodium, a Chronic Disease Risk Reduction Intake (National Academies of Sciences, Engineering, and Medicine [NASEM], 2019).
The Comparison
Each line gives Andre's average intake, what the app reported against the label Daily Value, and the correct comparison for men aged 19 to 30.
1. Magnesium, 480 mg. App: 114 percent of the Daily Value, flagged as "above upper limit." Correct comparison: RDA 400 mg, so intake is adequate. The Upper Level of 350 mg applies only to magnesium from supplements and medications, not food (Institute of Medicine, 1997). Every milligram here came from beans, oats and nuts. Warning reversed.
2. Potassium, 3,100 mg. App: 66 percent of a 4,700 mg Daily Value, flagged as "low." Correct comparison: Adequate Intake 3,400 mg for men 19 and older (NASEM, 2019), so intake is about 91 percent of the AI. Intakes below an AI cannot be judged inadequate with confidence. Warning softened to "slightly below the AI."
3. Iron, 14 mg. App: 78 percent of an 18 mg Daily Value, flagged as "low." Correct comparison: RDA 8 mg for adult men. Intake is well above the RDA. Warning reversed.
4. Fiber, 31 g. App: 111 percent of a 28 g Daily Value, marked "good." Correct comparison: Adequate Intake 38 g for men 19 to 50 (Institute of Medicine, 2005). Intake is about 82 percent of the AI. The app's praise was too generous.
5. Sodium, 3,400 mg. App: 148 percent of a 2,300 mg Daily Value, flagged "high." Correct comparison: Chronic Disease Risk Reduction Intake of 2,300 mg (NASEM, 2019). Intake is above it, so the flag stands, with the correct standard named.
6. Calcium, 1,050 mg. App: 81 percent of a 1,300 mg Daily Value. Correct comparison: RDA 1,000 mg for men 19 to 50 (Institute of Medicine, 1997). Intake meets the RDA.
7. Protein, 110 g. App: 220 percent of a 50 g Daily Value. Correct comparison: RDA 0.8 g per kilogram; at 80 kg, 64 g. Intake is high but within the acceptable range of 10 to 35 percent of energy and not a concern for a healthy adult.
Switching from label Daily Values to the reference intakes for his age and sex reversed two warnings, softened one, removed misplaced praise for fiber and kept one real concern, sodium, now tied to the right standard.
Interpreting the Results
Three cautions apply. First, three days of intake estimate usual intake poorly for nutrients that vary day to day, so these averages are approximate. Second, comparing an intake with an RDA can say that intake is probably adequate when it is at or above the RDA, but falling below an RDA does not prove inadequacy. Third, an intake below an Adequate Intake, as with potassium, means only that adequacy cannot be confirmed, because AIs are set where evidence is too limited for an RDA (NASEM, 2019).
Choosing the Right Value Type
The comparison also depends on which kind of reference value is used for each nutrient. An RDA sits high enough that almost everyone in the age and sex group is covered, so intake at or above it is very likely adequate. An Adequate Intake is used when evidence is insufficient to set an RDA, so it carries less certainty in both directions. An Upper Level marks the highest intake unlikely to cause harm, and for some nutrients it applies only to particular sources. Reading each line with the right value type is what turned the app's alarms into a calmer picture.
What Remains
After the correct comparison, Andre's record shows two areas worth attention. Sodium is above the risk reduction intake, mostly from canned beans, salted peanut butter and a frozen burrito he eats twice a week. Fiber is below its Adequate Intake despite his bean-heavy diet, partly because he uses white rice. Neither requires supplements; both are food choices.
Why the App Got It Wrong
The app is not malfunctioning. It is doing what it was built to do, comparing everything with the single Daily Value printed on labels, and applying an Upper Level without distinguishing food from supplements. The error lies in presenting a label convention as a personal assessment.
Limits
The comparison relies on the app's nutrient database, which may be inaccurate for some foods. Body weight was self-reported. No biochemical measures were available to confirm nutrient status.
References
Food and Drug Administration. (2016). Food labeling: Revision of the nutrition and supplement facts labels. Federal Register, 81(103), 33742-33999. https://www.federalregister.gov/documents/2016/05/27/2016-11867
Institute of Medicine. (1997). Dietary reference intakes for calcium, phosphorus, magnesium, vitamin D, and fluoride. National Academies Press. https://doi.org/10.17226/5776
Institute of Medicine. (2005). Dietary reference intakes for energy, carbohydrate, fiber, fat, fatty acids, cholesterol, protein, and amino acids. National Academies Press. https://doi.org/10.17226/10490
National Academies of Sciences, Engineering, and Medicine. (2019). Dietary reference intakes for sodium and potassium. National Academies Press. https://doi.org/10.17226/25353
What the HW320 Unit 4 assignment asks for
The comparison unit asks students to evaluate recorded intake against appropriate reference standards. Most prompts expect a table or list of nutrients, the person's average intake, the correct reference value for their life stage and sex, and an interpretation. Identify the value type for each nutrient, whether RDA, Adequate Intake, Upper Level or a chronic disease risk value, and use the most recent report. Explain what each comparison can and cannot show; intake below an Adequate Intake, for instance, does not prove deficiency. Note where a limit applies only to certain sources. If software used another standard, show both and explain the difference. Remember that a few days estimate usual intake poorly. Three to four pages is common.
Inside the HW320 Unit 4 example
The record and the app's Daily Value approach are described first. A section explains how label Daily Values differ from life-stage reference intakes. Seven numbered lines then compare magnesium, potassium, iron, fiber, sodium, calcium and protein, each with the app's verdict and the correct one, and the highlighted sentence sums up two reversals, one softening, lost praise for fiber and one real concern. A section on value types explains RDAs, Adequate Intakes and Upper Levels. Interpretation cautions follow. A section names what remains, sodium from canned and packaged foods and fiber limited by white rice, and another explains why the app behaved as designed. Limits close the paper.
Reading the HW320 Unit 4 grading rubric
Rubrics for HW320 reference comparisons generally weight correct standard selection most: the right reference values for the person's age and sex, from current reports, with the value type identified. Accurate interpretation is next, including what comparisons with RDAs, Adequate Intakes and Upper Levels can support. Points go to recognizing limits such as source-specific Upper Levels and the short recording period. Clear presentation of the comparison earns points for organization. Practical conclusions drawn from the corrected comparison count under application. Citations to the reference reports in APA complete the rubric. Comparisons that rely on label Daily Values or treat any intake below an RDA as a deficiency typically lose accuracy points.
Common HW320 Unit 4 mistakes, and how to avoid them
The commonest problem in this unit is accepting the software's percentages without asking what standard produced them. Another is using reference values for the wrong age or sex band. Students often apply magnesium's Upper Level to food, or treat an intake below an Adequate Intake as a confirmed shortfall. Outdated values, such as an older potassium figure, also appear frequently. Interpretation sections sometimes list numbers without saying which matter, leaving the reader to guess whether sodium or fiber deserves attention first. If your analysis software printed warnings you are unsure about, the comparison can be redone against the intakes for that person's age and sex once we see the report.
Get an HW320 Unit 4 example written to your instructions
Share the averaged record and the age and sex band it belongs to, and attach the prompt and rubric for Unit 4. Each nutrient is matched to the correct standard, type and scope, and the table shows what changes when the right figure replaces a default. It is back in 24-48h, and a first comparison is free. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.
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HW320 Unit 4 questions, answered
Which reference values should the comparison use?
The Dietary Reference Intakes for the person's exact age and sex band, taken from the most recent report for each nutrient, unless your prompt names another standard. Avoid comparing an individual against label Daily Values, since those were set to cover most people at once and serve packages rather than persons. Name the report and year for every nutrient in the table.
Why does the upper limit for magnesium not apply to food?
The reference report set that limit from effects seen with supplemental and medicinal magnesium, and food sources have not been shown to cause them. A few other upper levels, including those for folic acid and niacin, are likewise limited to certain forms. Reading the scope statement in the report, not only the number, is what keeps a comparison from flagging a perfectly ordinary pattern.
What if my record was analyzed with software that uses outdated values?
Report what the software printed, then redo the comparison against the current values and show both. Graders usually reward noticing the discrepancy more than they penalize the software. State the edition each figure comes from, and if the prompt requires the course's own program, use it while noting any value that has since been revised.
Where can I find a free HW320 Unit 4 sample paper?
This page presents a complete Unit 4 reference standard comparison for a 26-year-old man, with app verdicts set against the correct reference intakes, margin notes and APA references.
Why did the app flag iron as low when it was not?
The app compared his intake with the 18 milligram Daily Value printed on labels, which matches the needs of menstruating women. The allowance for adult men is 8 milligrams, and he ate 14.