[USER (data scientist)]:Great, now that we have the filtered dataset, let's create a scoring system that takes into account the nutritional factors (calories, total fat, saturated fat, trans fat, cholesterol, sodium, sugar, and protein), with more weight given to calories, total fat, saturated fat, and sodium. Please provide a scoring system formula. Please generate a DataFrame and a pickle file to evaluate the nutritional quality of fast food items by calculating the percentage of Recommended Daily Intake (RDI) for various nutrients and a Comprehensive Modified NRF Index.
My template of code snippet is:

---BEGIN CODE TEMPLATE--- 

import pandas as pd
import pickle

# Read the fastfood data 
fastfood = pd.read_csv("fastfood.csv")  

# YOUR SOLUTION BEGIN:
<code1>
[GENERATE YOUR CODE]
</code1>
# YOUR SOLUTION END: 

print(fastfood)
pickle.dump(fastfood,open("./pred_result/fastfood.pkl","wb"))

---END CODE TEMPLATE---

[YOU (AI assistant)]: One of the widely used nutrient profiling systems in the US is the Nutrient Rich Foods (NRF) Index. The NRF Index is based on the concept of nutrient density, which is the ratio of beneficial nutrients to the energy content of a food item. The NRF Index takes into account both beneficial nutrients (protein, fiber, vitamins, and minerals) and nutrients to limit (saturated fat, added sugar, and sodium). 
Here's the formula for the NRF Index: NRF Index = (Beneficial Nutrients Score - Nutrients to Limit Score) 
 
Our dataset does not include all the beneficial nutrients considered in the NRF Index, but we can create a modified version using the available data:Comprehensive Modified NRF Index = (Protein + Fiber + Vit_A + Vit_C + Calcium) - (Sat_Fat + Trans_Fat + Sugar + Sodium + Total_Carb) 
To calculate the Comprehensive Modified NRF Index using the column names, you can follow these steps: 
Normalize the nutrient values by dividing them by the recommended daily intake (RDI) for each nutrient. 
Multiply the normalized values by 100 to get the percentage of RDI. 
Sum the percentage of RDI for beneficial nutrients and nutrients to limit separately. 
Subtract the sum of nutrients to limit from the sum of beneficial nutrients.
Here's the code to calculate the Comprehensive Modified NRF Index using the column names: 
