# Diet

> Diet and Nutrition Tracking Skill

- Skill: `huifer/diet` (Agent Skill, multi-file: 4 files)
- Install (CLI): `npx skillmds@latest add huifer/diet`
- Raw SKILL.md: https://api.skillmd.com/api/skills/huifer/diet/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: huifer (https://skillmd.com/u/huifer)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/huifer/diet

---


# Diet and Nutrition Tracking Skill

Record daily meals through photos or uploads, automatically analyze nutritional content, and track nutritional intake.

## Core Flow

```
User Input → Identify Operation Type → [add] Analyze Image → Nutrition Analysis → Save Record
                              ↓
                         [history/status/summary] → Read Data → Display Report
```

## Step 1: Parse User Input

### Operation Type Recognition

| Input Keywords | Operation Type |
|----------------|----------------|
| add | add - Add diet record |
| history | history - View history records |
| status | status - Nutrition statistics |
| summary | summary - Nutrition summary |

### Meal Classification (Based on Meal Time)

| Time Range | Meal Type |
|------------|-----------|
| 05:00 - 09:59 | Breakfast |
| 10:00 - 14:59 | Lunch |
| 15:00 - 16:59 | Afternoon Tea |
| 17:00 - 21:59 | Dinner |
| 22:00 - 04:59 | Late Night Snack |

## Step 2: Check Information Completeness

### For add operation, required:
- `image` - Food photo path

### For add operation, optional:
- `meal_time` - Meal time (defaults to current time)

### For history/status/summary operations:
- No parameters required, optional time range

## Step 3: Interactive Prompts (If Needed)

### Scenario A: No Image Provided
```
Please provide a food photo. You can drag and drop or specify the path.
```

### Scenario B: Invalid Image Path
```
Cannot read the image. Please check if the path is correct.
Supported formats: JPG, PNG, WebP
```

### Scenario C: Invalid Time Format
```
Invalid time format. Please use HH:mm or YYYY-MM-DD HH:mm format
Example: 12:30 or 2025-12-30 12:30
```

## Step 4: Generate JSON

### Diet Record Data Structure

```json
{
  "id": "20251231123456789",
  "record_date": "2025-12-31",
  "meal_time": "12:30",
  "meal_type": "Lunch",
  "image_path": "food.jpg",
  "foods": [
    {
      "name": "Rice",
      "portion": "1 bowl (about 150g)",
      "weight_estimate": 150,
      "cooking_method": "Steamed",
      "confidence": 0.95
    }
  ],
  "nutrition": {
    "calories": {
      "value": 485,
      "unit": "kcal"
    },
    "macronutrients": {
      "protein": { "value": 15.2, "unit": "g" },
      "fat": { "value": 18.5, "unit": "g" },
      "carbohydrate": { "value": 60.3, "unit": "g" },
      "fiber": { "value": 6.2, "unit": "g" }
    },
    "vitamins": {
      "vitamin_a": { "value": 245, "unit": "μg" },
      "vitamin_c": { "value": 35, "unit": "mg" }
    },
    "minerals": {
      "calcium": { "value": 45, "unit": "mg" },
      "iron": { "value": 2.8, "unit": "mg" }
    }
  },
  "health_score": {
    "overall": 7.5,
    "balance": 8.0,
    "variety": 7.0,
    "nutrition_density": 7.5
  }
}
```

## Step 5: Save Data

1. Generate file path: `data/diet-records/YYYY-MM/YYYY-MM-DD_HHMM.json`
2. Create month directory (if not exists)
3. Save JSON data file
4. Update global index `data/index.json`

## Execution Instructions

```
1. Parse user input, identify operation type
2. For add operation:
   a. Use Read tool to read image
   b. Analyze food types and portions
   c. Calculate nutritional content
   d. Save record to data/diet-records/
3. For history operation: Display diet history
4. For status operation: Display nutrition statistics
5. For summary operation: Display nutrition summary
```

## Nutrition Reference

### Common Staple Food Portions
- 1 bowl rice ≈ 150g (180 kcal)
- 1 bowl noodles ≈ 200g (220 kcal)
- 1 steamed bun ≈ 100g (220 kcal)

### Meat Portions
- Pork 100g ≈ 250 kcal
- Chicken 100g ≈ 130 kcal
- Fish 100g ≈ 100 kcal

### Vegetable Portions
- Leafy vegetables 1 serving ≈ 200g (40 kcal)
- Root vegetables 1 serving ≈ 200g (80 kcal)

## Adult Daily Nutrition Recommendations

### Macronutrients
- Calories: 1800-2400 kcal
- Protein: 55-75 g
- Fat: 55-75 g
- Carbohydrates: 250-350 g
- Dietary Fiber: 25-35 g

### Major Vitamins
- Vitamin A: 700-900 μg
- Vitamin C: 100 mg
- Vitamin D: 10-20 μg

### Major Minerals
- Calcium: 800-1000 mg
- Iron: 12-18 mg
- Zinc: 10-15 mg

For more examples, see [examples.md](examples.md).