TL;DR
Three macronutrients, three problems. Protein: most preppers don't store enough — plan for 50-80g per adult per day. Fat: almost completely ignored in standard storage plans — plan for 50-80g per adult per day. Carbohydrates: usually adequately covered by rice, beans, and grains. A storage diet that ignores fat and protein produces calorie-adequate but nutritionally failing individuals within months.
The Three Macronutrients
Carbohydrates provide the primary energy currency for the brain and muscles. 4 calories per gram. The body stores approximately 400-500g as glycogen (immediately available) and can convert fat to ketones as an alternative fuel when carbohydrate intake is very low.
Protein provides amino acids for tissue repair, immune function, enzyme production, and — when carbohydrate is scarce — energy. 4 calories per gram. Cannot be stored in significant quantity; daily intake is essential for maintenance.
Fat provides concentrated energy (9 calories per gram), essential fatty acids that the body cannot synthesize, and is required for absorption of vitamins A, D, E, and K. Body fat stores can provide substantial energy reserves during caloric deficit, but dietary fat intake is still required for essential fatty acids and vitamin absorption.
Minimum Daily Requirements
| Macronutrient | RDA (sedentary adult) | Survival minimum | Notes | |---------------|----------------------|------------------|-------| | Protein | 0.8g/kg body weight | 50-70g for 70kg adult | Higher under physical stress | | Fat | No strict RDA; AI 11-17g essential fatty acids | 30-50g minimum | Higher for absorption of fat-soluble vitamins | | Carbohydrates | 130g minimum (brain requirement) | 130g minimum | Brain runs on glucose; less forces ketosis |
For active survival scenarios, add 20-40% to protein requirements and additional fat for caloric density.
What Standard Storage Plans Miss
The default prepper storage plan is often: rice, beans, oats, canned vegetables. This is:
- High in carbohydrates: adequate
- Moderate in protein: marginal
- Very low in fat: dangerously insufficient long-term
A pound of dried rice provides 1,650 calories but only 32g of protein and essentially 0g of fat. A pound of dried lentils provides 1,500 calories and 104g of protein — but still essentially 0g of fat.
Fat storage is the most overlooked macronutrient in emergency preparedness.
To meet minimum fat needs (50g/day/adult), you need approximately 3 tablespoons of cooking oil per day. For a family of four for one year:
- 3 tablespoons × 4 people × 365 days = 4,380 tablespoons
- That's approximately 275 cups of oil, or roughly 17 gallons
Most families store two or three quarts of vegetable oil. That's a fraction of what's needed.
Fat Storage Solutions
| Fat Source | Shelf Life (unopened) | Calories per Cup | |------------|----------------------|-----------------| | Vegetable oil (canola, soybean) | 2-3 years | ~1,900 | | Coconut oil | 2-5 years (saturated fat resists rancidity) | ~1,900 | | Ghee (clarified butter) | 1-2 years room temp; 2+ years refrigerated | ~1,900 | | Lard (rendered pork fat) | 6 months room temp; 1 year sealed | ~1,900 | | Tallow (rendered beef fat) | 1-2 years | ~1,900 | | Pemmican | 1-5 years | ~2,000/pound | | Olive oil | 1-2 years | ~1,900 |
For maximum storage life: ghee, tallow, and coconut oil are the most shelf-stable fats.
Protein Adequacy in Storage Foods
A storage diet of rice and beans can meet protein requirements if portions are planned:
Daily protein targets (average adult): 60-80g protein per day
| Food | Protein per Cup (cooked) | |------|--------------------------| | Lentils | 18g | | Black beans | 15g | | Kidney beans | 13g | | Chickpeas | 15g | | Canned tuna (3 oz) | 22g | | Canned salmon (3 oz) | 20g | | Peanut butter (2 tbsp) | 8g | | Egg powder (2 tbsp) | 5g | | Rolled oats (1 cup cooked) | 6g | | White rice (1 cup cooked) | 4g |
A daily target of 1.5 cups of cooked beans/lentils + 2 tablespoons of peanut butter + a cup of oats provides approximately 50-55g protein — enough for maintenance with minimal activity.
Add canned meats (tuna, chicken, salmon), egg powder, or jerky to reach higher protein targets.
The Complete Protein Myth
Older nutritional guidance required eating complementary proteins at the same meal (rice with beans, corn with legumes). Current understanding confirms that the body maintains a temporary amino acid pool from which it can draw throughout the day.
Eating rice at one meal and beans at another — or any combination of plant proteins throughout the day — provides complete amino acid coverage as long as both are consumed within the same day. Precise meal-by-meal combining is unnecessary.
Sample Daily Macro Calculation (One Adult)
Target: 2,200 calories, 70g protein, 70g fat, 300g carbohydrates
| Food | Calories | Protein | Fat | Carbs | |------|---------|---------|-----|-------| | Oatmeal (1 cup dry) | 300 | 10g | 5g | 54g | | 2 tbsp peanut butter | 190 | 8g | 16g | 6g | | Lentil soup (1.5 cups cooked lentils) | 340 | 27g | 1g | 58g | | White rice (1 cup dry, cooked) | 340 | 7g | 1g | 74g | | Canned tuna (5 oz) | 150 | 33g | 2g | 0g | | 3 tbsp cooking oil (cooking) | 360 | 0g | 40g | 0g | | Hardtack (3 pieces) | 330 | 9g | 1.5g | 66g | | Various vegetables (canned) | ~150 | ~5g | ~1g | ~30g | | Total | ~2,160 | ~99g | ~67g | ~288g |
This represents a realistic, achievable survival diet using entirely stored foods.
Sources
- Institute of Medicine - Dietary Reference Intakes for Macronutrients
- USDA Dietary Guidelines for Americans 2020-2025
- Cahill, George F. Jr - Fuel Metabolism in Starvation, Annual Review of Nutrition 2006
Frequently Asked Questions
How much protein do you need per day for survival?
The Recommended Dietary Allowance (RDA) is 0.8 grams of protein per kilogram of body weight per day for sedentary adults. For a 70kg (154 lb) person: 56 grams per day. Under physical stress, illness, or recovery, requirements increase to 1.2-2.0g/kg. A cup of dried lentils provides approximately 50g of protein when cooked. Rice and beans together form a complete protein with all essential amino acids.
What happens to the body on a pure carbohydrate diet with no fat?
Fat deficiency on a zero-fat diet causes failure to absorb fat-soluble vitamins (A, D, E, K), leading to night blindness (vitamin A), immune failure, and bleeding disorders over weeks to months. Essential fatty acids (linoleic and alpha-linolenic acid) are required for cell membrane function and cannot be synthesized by the body. Rabbit starvation — the phenomenon of dying from protein poisoning while eating enough calories — demonstrates the lethal consequences of inadequate fat in an otherwise sufficient diet.
Is it safe to eat only rice and beans long-term?
Rice and beans together provide all essential amino acids (rice provides the ones beans lack, and vice versa). They do not need to be eaten at the same meal — consuming both within the same day is sufficient. However, a diet of only rice and beans is deficient in: vitamins A, C, B12, D; calcium; essential fatty acids; and zinc. Supplementation, sprouts, or diversification of the food supply is necessary for long-term health.