Thanks for the suggestion! I managed to squish the program down into 105 lines. This is my MRE.

#include<stdlib.h>
#include<confuse.h>

struct entry
	{
	int Day;
	long int Date;
	float C;
	float F;
	float P;
	float L;
	};

int DiaryNum;
struct entry  *Diary;
char DiaryPath[] = "/home/lofenyy/.config/Calorimeter/Diary";

cfg_opt_t entry_opts[] = 
	{
	CFG_INT("Date", 0, CFGF_NONE),
	CFG_INT("Day", 0, CFGF_NONE),
	CFG_FLOAT("C", 0, CFGF_NONE),
	CFG_FLOAT("F", 0, CFGF_NONE),
	CFG_FLOAT("P", 0, CFGF_NONE),
	CFG_FLOAT("L", 0, CFGF_NONE),
	CFG_END()
	};

cfg_opt_t entry_base_opts[] =
	{
	CFG_SEC("Entry", entry_opts, CFGF_MULTI),
	CFG_END()
	};

int lodEntry()
	{
	//Initialization
	cfg_t *cfg;
	cfg_t *cfg_entry;
	cfg = cfg_init(entry_base_opts, CFGF_NONE);
	
	//Open our file and check for errors
	if(cfg_parse(cfg, DiaryPath) == CFG_PARSE_ERROR)
		printf("Err!\n");
	
	//Allocate enough memory for our internal diary
	DiaryNum = cfg_size(cfg, "Entry");
	Diary = malloc(DiaryNum * sizeof(struct entry));	
	
	//For every entry in our external diary
	for(int C = 0;C < cfg_size(cfg, "Entry");C++)
		{
		//Copy our entries to our internal diary
		cfg_entry = cfg_getnsec(cfg, "Entry", C);
		Diary[C].Date	= cfg_getint(cfg_entry, "Date");
		Diary[C].Day	= cfg_getint(cfg_entry, "Day");
		Diary[C].C	= cfg_getfloat(cfg_entry, "C");
		Diary[C].F	= cfg_getfloat(cfg_entry, "F");
		Diary[C].P	= cfg_getfloat(cfg_entry, "P");
		Diary[C].L	= cfg_getfloat(cfg_entry, "L");
		}
	
	cfg_free(cfg);
	}

double getEntryCalories(int C)
	{
	//4 calories per carb and protein. 9 per lipid. 
	return 4*(Diary[C].C+Diary[C].P)+9*(Diary[C].L);
	}

int prnStats()
	{
	float C,F,P,L,Calories = 0;
	int day0 = Diary[0].Day;
	int day1 = Diary[DiaryNum -1].Day;
	int days = (day1 - day0) +1;
	
	//For every diary entry
	for(int i = 0;i < DiaryNum;i++)
		{
		//Count up our nutrients
		C = C + Diary[i].C;
		F = F + Diary[i].F;
		P = P + Diary[i].P;
		L = L + Diary[i].L;
		Calories = Calories + getEntryCalories(i);
		}
	
	//Print them out
	printf("Average Calories: %2.2f\n", (float)(Calories/days));
	printf("Average Carbs: %2.2f\n", (float)(C/days));
	printf("Average Fibre: %2.2f\n", (float)(F/days));
	printf("Average Proteins: %2.2f\n", (float)(P/days));
	printf("Average Lipids: %2.2f\n", (float)(L/days));
	}

int main(int argc, char  *argv[])
	{
	// Load our internal food diary from our external food diary
	// print out our statistics
	lodEntry();
	prnStats();
	}

This is the contents of Diary

Entry
{
	Date = 1679542784
	Day = 0
	C = 6.000000
	F = 5.000000
	P = 4.000000
	L = 3.000000
}

Entry
{
	Date = 1679546112
	Day = 0
	C = 60.000000
	F = 50.000000
	P = 20.000000
	L = 1.000000
}

Entry
{
	Date = 1679547008
	Day = 0
	C = 4.000000
	F = 4.000000
	P = 4.000000
	L = 4.000000
}

Entry
{
	Date = 1679547136
	Day = 1
	C = 4.000000
	F = 4.000000
	P = 4.000000
	L = 4.000000
}

Entry
{
	Date = 1679547136
	Day = 5
	C = 60.000000
	F = 50.000000
	P = 20.000000
	L = 1.000000
}