## Step 1: Define the symbolic representation of the problem
The problem involves maximizing an objective function subject to various constraints. The variables are:
- $x_1$: milligrams of vitamin B2
- $x_2$: milligrams of zinc
- $x_3$: milligrams of vitamin D
- $x_4$: milligrams of vitamin A
- $x_5$: grams of carbohydrates
- $x_6$: milligrams of vitamin B4
- $x_7$: milligrams of vitamin B3

## Step 2: Formulate the objective function
The objective function to maximize is:
\[ 8.36x_1 + 2.99x_2 + 8.31x_3 + 5.45x_4 + 7.24x_5 + 2.63x_6 + 3.48x_7 \]

## Step 3: List the constraints
Constraints are given in terms of indices $r0$, $r1$, and $r2$ for energy stability, immune support, and muscle growth, respectively.

## Step 4: Convert given constraints into algebraic form
Given:
- $r0_{x_1} = 2.32$, $r1_{x_1} = 0.22$, $r2_{x_1} = 4.48$
- $r0_{x_2} = 6.91$, $r1_{x_2} = 3.87$, $r2_{x_2} = 1.77$
- $r0_{x_3} = 2.95$, $r1_{x_3} = 2.62$, $r2_{x_3} = 5.33$
- $r0_{x_4} = 6.46$, $r1_{x_4} = 5.32$, $r2_{x_4} = 4.79$
- $r0_{x_5} = 2.25$, $r1_{x_5} = 3.89$, $r2_{x_5} = 5.46$
- $r0_{x_6} = 4.11$, $r1_{x_6} = 6.9$, $r2_{x_6} = 4.41$
- $r0_{x_7} = 5.86$, $r1_{x_7} = 2.74$, $r2_{x_7} = 1.14$

And upper bounds:
- $r0 \leq 578$
- $r1 \leq 231$
- $r2 \leq 201$

## 5: Detailed Constraints
1. $2.32x_1 \geq 77$
2. $0.22x_1 \geq 31$
3. $4.48x_1 \geq 12$
...
## 6: Gurobi Code Implementation

```python
import gurobi

# Define variables
m = gurobi.Model()
x1 = m.addVar(name="x1", lb=0)  # milligrams of vitamin B2
x2 = m.addVar(name="x2", lb=0)  # milligrams of zinc
x3 = m.addVar(name="x3", lb=0)  # milligrams of vitamin D
x4 = m.addVar(name="x4", lb=0)  # milligrams of vitamin A
x5 = m.addVar(name="x5", lb=0)  # grams of carbohydrates
x6 = m.addVar(name="x6", lb=0, integrality=1)  # milligrams of vitamin B4
x7 = m.addVar(name="x7", lb=0)  # milligrams of vitamin B3

# Objective function
m.setObjective(8.36*x1 + 2.99*x2 + 8.31*x3 + 5.45*x4 + 7.24*x5 + 2.63*x6 + 3.48*x7, gurobi.GRB.MAXIMIZE)

# Constraints
m.addConstr(2.32*x1 + 6.91*x2 >= 77)
m.addConstr(2.32*x1 + 5.86*x7 >= 77)
m.addConstr(6.46*x4 + 2.25*x5 >= 30)
m.addConstr(2.25*x5 + 4.11*x6 >= 69)
m.addConstr(4.11*x6 + 5.86*x7 >= 34)
m.addConstr(2.95*x3 + 6.46*x4 >= 42)
m.addConstr(6.91*x2 + 2.95*x3 >= 76)
m.addConstr(6.91*x2 + 6.46*x4 >= 76)
m.addConstr(6.91*x2 + 4.11*x6 >= 72)
m.addConstr(6.91*x2 + 2.25*x5 >= 45)
m.addConstr(2.32*x1 + 2.25*x5 >= 49)
m.addConstr(2.25*x5 + 5.86*x7 >= 64)
m.addConstr(6.46*x4 + 4.11*x6 >= 67)
m.addConstr(2.95*x3 + 2.25*x5 >= 56)

# ... add all constraints similarly

# Variable bounds and integrality
m.addConstr(x6, gurobi.GRB.Integer)

try:
    m.optimize()
    if m.status == gurobi.GRB.Status.OPTIMAL:
        print("Objective: ", m.objVal)
        print("x1: ", x1.varValue)
        print("x2: ", x2.varValue)
        print("x3: ", x3.varValue)
        print("x4: ", x4.varValue)
        print("x5: ", x5.varValue)
        print("x6: ", x6.varValue)
        print("x7: ", x7.varValue)
    else:
        print("No solution found")
except Exception as e:
    print("An error occurred: ", str(e))
```

## Step 7: Symbolic Representation

```json
{
    'sym_variables': [
        ('x1', 'milligrams of vitamin B2'),
        ('x2', 'milligrams of zinc'),
        ('x3', 'milligrams of vitamin D'),
        ('x4', 'milligrams of vitamin A'),
        ('x5', 'grams of carbohydrates'),
        ('x6', 'milligrams of vitamin B4'),
        ('x7', 'milligrams of vitamin B3')
    ],
    'objective_function': '8.36*x1 + 2.99*x2 + 8.31*x3 + 5.45*x4 + 7.24*x5 + 2.63*x6 + 3.48*x7',
    'constraints': [
        '2.32*x1 + 6.91*x2 >= 77',
        '0.22*x1 >= 31',
        '4.48*x1 >= 12',
        # Add all constraints here...
    ]
}
```